Hush-Kit Aviation World

The attack helicopter is costly and complex to operate, yet it is taking a mauling in the Russian invasion of Ukraine. Russia’s full-scale invasion attempt of Ukraine starting in 2022 has shown both the vulnerability of helicopters and the effectiveness of small, uncrewed aircraft against armour. With this in mind, we ask: Is the attack helicopter dead?

• Ron Smith

Few observers thought Ukraine could withstand the Russian onslaught of 2022. Footage released in April footage of the destruction of a Russian Kamov attack helicopter was a huge morale boost. And more followed. The war in Ukraine has been marked by staggering losses of both anti-armour helicopters and armour.

VIDEO: Ukrainian forces shoot down Russian helicopter with Stugna-P anti-tank missile. – @Kochevenko https://t.co/jlbtMPXigy

— Conflict News (@Conflicts) April 5, 2022

Armour operations

Typical Western doctrine (offensive or defensive) uses manned armoured reconnaissance ahead of the Forward Line of Own Troops (FLOT) to locate enemy forces and determine their intentions. Increasingly, manned operations will be supported by other ISR (intelligence, surveillance, and reconnaissance) platforms, such as Uncrewed Air Vehicles (UAV) and later Uncrewed Ground Vehicles (UGVs), to augment the manned platforms.

Recce: This is driven by a recce Plan determined by the Commander’s Critical Information Requirements (CCIRs), designed to fill in gaps in intelligence and distinguish enemy feints and deception tactics from their main force’s true intentions and timing. Other objectives would typically be to locate enemy command and control, logistics, air defence units, long-range artillery, and other high-value/high-threat components.

The recce info will then shape the deployment of main armour and infantry (again offensive or defensive), supporting anti-armour helicopter and precision long-range artillery operations.

Manned armoured reconnaissance beyond the FLOT (i.e., in enemy territory) is likely hazardous, particularly if the enemy has effective electronic surveillance capabilities. Traffic analysis can be used to locate signal traffic from unknown forces and, even if encrypted, is likely to result in unwelcome attention. The US tends to assume its comms cannot be read, so it reports every enemy observation. The UK is more concerned about detected transmissions (even if not read) and operates largely under radio silence.

Terrain masking to avoid detection may make Very High Frequency traffic difficult, so HF or datalink to SATCOMs may have to be used.

Armour and Mechanised Infantry: In addition, armour, on both sides, is having a hard time. In the Ukraine case, the threat has proven to be a combination of precision artillery and long-range missile attack, combined with top attack by armed drones. 

The author identified this latter threat as a concern more than a dozen years ago – having noted that Hezbollah, in the first Lebanon conflict, had deployed armed drones against Israeli armour.

Because the high mass of protective armour leads to weight and mobility issues, MBT protection is concentrated against direct fire attacks from other MBTs. Top protection is typically reduced, primarily against artillery near misses rather than direct hits, which are now the norm. Even with these measures, deployed MBT mass is typically around 62 tonnes, and top protection is one area that is typically traded off to achieve acceptable mobility.

Active protection systems are not yet regarded as mature and may introduce hazards to nearby personnel (if operating with infantry, for example). I am unsure how successful these are in Israeli use, or whether they have been used successfully in Ukraine.

Furthermore, Western armour generally has no organic means of detecting or countering the drone threat, although directed energy weapons or RF countermeasures may offer some capability in the future and are undoubtedly being actively researched and trialled.

So heavy armour is looking increasingly vulnerable, as, in the Ukrainian conflict at least, attack helicopters. However, heavy armour is clearly still important for taking and holding ground, so it will most likely continue to be central in many operations. 

Attack Helicopter operations

When the UK was developing its thinking for GST3971 to acquire a dedicated attack helicopter in the mid-1980s, the vision was of a helicopter that could engage in autonomous direct-fire attack of heavy armour. The threat was essentially Cold War, with massed Soviet armour operating across the North German Plain. Organic air defence (then primarily radar-directed ZSU-23-4) was a significant threat, leading to a desire to stand-off outside its lethal range. Priority targets were enemy air defence, command and control centres and heavy armour.

The solution was deemed to be a low-signature helicopter (radar and IR signatures, particularly) fitted with a mast-mounted sight and using terrain screening. A long-range fire-and-forget weapon was required so that the helicopter would not be exposed throughout the weapon’s flight time.

Initially, Apache was not favoured because the AH-64A was regarded as having large visual and radar signatures and an inadequate sighting system. Without a mast-mounted sight, Scout helicopter support would also be required for target acquisition and designation.

The AH-64D with Longbow and RF Hellfire largely solved these problems by acquiring targets at long range and engaging in indirect fire. However, the missile and target detection range exceeded the recognition and identification range of the TADS sight (which also required the helicopter to be exposed to gain a line of sight to the target). This introduced some concern about the ability to achieve positive target identification when operating under restrictive rules of engagement.

The Situation in Ukraine

Russian operations over Ukrainian-held territory

Today, taking the Ukraine experience as representative, Russian attack helicopters are operating over large regions of Ukrainian-held territory without air superiority and with a dispersed infantry threat armed with capable MANPADS systems. The defending forces can adopt positions that are well hidden, but which offer good fields of fire. 

The difficulty of detecting and countering this threat, combined with extensive areas lacking terrain cover, significantly increases the risk to attack helicopters in transit to and from their targets. This is compounded by the apparent ineffectiveness of the helicopter protection and countermeasures equipment.

There are reports of both sides in Ukraine using armed drones for anti-personnel operations against individual soldiers, so operation under cover, if not actually below ground is becoming necessary, if there are enemy drones in the area. This undoubtedly reduces the opportunities for, or increases the risk of, MANPADS operation.

Ukraine perspective – early phase

In the early phase of the invasion there was an armoured attack along the borders, but particularly moving south towards Kyiv from Belarus. This was largely canalised along main routes, as were its supporting logistic columns. This resulted in heavy losses. These were inflicted mainly by mines and artillery. Flooding of off-road terrain reduced the transit route options for the invading force.

Later Developments

After being pushed back from Kyiv in the initial armour thrust, Russian armour and mechanised infantry have been grinding out attacks from Ukraine’s borders, particularly from the south and east. This relatively static land battle is accompanied by long-range missile attacks on critical infrastructure and population centres.

Both sides have effective anti-aircraft missile systems, and neither side has achieved full air superiority over the battlefield. The later Russian attack has featured the use of medium- to long-range stand-off weapons (cruise or ballistic missiles and glide bombs), air-or ground-launched, often from within Russian territory. There seems little scope to counter this, while the political does not exist to mount attacks on launch locations well into Russian territory. The best possible missile defence system may ameliorate damage but will not hasten the end of the conflict, which has become strategic rather than tactical.

Significant numbers of western ground-to-air missile systems are also being supplied. Ukrainian anti-armour operations have increasingly been able to use precision artillery such as HIMARS and ATACMS. The availability of such systems and their munitions is likely to be in short supply and is dependent on enduring political support from EU and NATO countries. It is, therefore, vulnerable, for example, should Donald Trump be returned as US President following the November election.

It seems likely that NATO surveillance assets (E-3, RC-135W, U-2S and satellite cover) are gathering real time intelligence over the battlefield – whether such information is being passed to inform Ukraine deployments and targeting decisions has not been revealed. In any future conflict, using such overhead assets and effective datalinks to transmit near real-time intelligence is likely to be key to effective offensive or defensive operations.

Both Russia and the Ukraine have adopted the use of armed drones for the top attack of armour and these appear to have been very successful. (Relatively little imagery has been released showing Ukraine anti-armour helicopter attacks on Russian armour, or indeed Russian helicopter attacks on Ukrainian armour – Western or otherwise).

NATO nations are beginning to supply air-to-ground weapons such as Brimstone and Storm Shadow, and F-16 aircraft have entered Ukrainian service. It is not known whether Western air-to-ground missiles have been integrated for release from existing Russian-built equipment operating with the Ukrainian Air Force.

Suggested Success Factors for Helicopter anti-armour operations

What do you need for successful helicopter anti-armour missions? Ideally, you want air superiority and not to operate over large swathes of enemy-held territory occupied by determined resistance, equipped with capable MANPADS and other air defence systems such as S-200 and S-300. 

Here is a list of possible success factors for postulated helicopter anti-armour operations.

• Accurate intelligence as to disposition and movement of enemy armour: satellite, aerial recce, stand-off radar, comms / SIGINT, manned armoured reconnaissance, SF, etc.
• A command and control infrastructure capable of providing updated target information in near real-time
• Ability to comply with restrictive rules of engagement when necessary
• Preferably having air superiority over the area of operations
• Ability to reach an engagement position with minimal exposure to threat systems
• Ability to engage at long-range
• The necessity of avoiding enemy drone threats to AH is likely to favour mobile rather than static operation.
• Carriage of sufficient weapons to inflict significant attrition on the enemy force (likely to determine the number of helicopters in the attack)
• Use of longer-range missiles (Rafael Spike NLOS quotes 27 km range, helicopter-launched Brimstone is said to have similar range capability).
• Proven and effective countermeasures against unexpected missile attack – missile launch detection and tracking, plus sophisticated countermeasures and effective signature reduction. Today, there must be some query as to the availability and effectiveness of such systems.
• Ballistic tolerance at least against small arms and medium machine gun threats
• Reliable, low-maintenance platform, capable of operation in all weather and climatic conditions.
• Crashworthy fuel systems
• Run-dry transmission systems

Defensive Operations

The above factors suggest that deploying attack helicopters operating defensively (over one’s territory) could still be effective.

If the enemy uses the same or similar equipment, there would still be problems to solve regarding positive target ID. Also, effective command and control to deal with a fluid ground situation could be problematic, as could maintaining a supply of munitions to the AH force. Missile countermeasures remain an uncertain problem.

Offensive Operations

Long-range indirect fire engagements would be preferred for both offensive and defensive operations, and they would probably be essential in the offensive case. 

The high helicopter losses sustained by Russia in current offensive operations probably reflect high risk operations, in the face of determined opposition with capable weapons and not much terrain cover for the helicopters. Also, no air superiority to provide top cover and hinder ground air defence, together with apparently ineffective measures to hinder missile lock-on and to break lock, once engaged.

Moreover, the threat is not the organic air defences of battlegroups or a Soviet Motor-Rifle Regiment or Brigade but dispersed and well-hidden infantry and special forces units equipped with modern MANPADS missile systems. Furthermore, because the enemy forces are operating over the defenders’ own ground, the defence can be cued and alerted to approaching helicopters, given good data connectivity.

In the case of offensive operations, it would appear that stand-off operations from the ground already held by one’s own forces might be the order of the day. In this case, the helicopters might operate similarly to a highly mobile precision artillery unit, able to redeploy kilometres across the field of operations in minutes. With a lack of local air superiority, the Russian use of stand-off weapons launched from within their territory supports this proposition.

A further consideration is that maintaining the mobility of the helicopter force is likely to benefit it by hampering any drone threat targeted at it.

The focus of attack might shift towards enemy logistics – MBTs without fuel or ammunition cannot conduct manoeuvre warfare. 

Increasing the range at which the attack is conducted could suggest the use of larger helicopters to carry the heavier weapons likely to be required – feasible if operating over safe ground. The carriage of Exocet on certain export Sea King aircraft is an example of such a usage. Rafael Spike and Brimstone are also attracting interest because of their long-range capability. Clearly, target selection would be entirely dependent on the higher-level ISTAR infrastructure, although salvo-fired Brimstone has already shown some autonomous target discrimination capability.

An alternative to using one heavy long-range missile per tank destroyed might be to use a larger helicopter to launch long-range drone-carrying systems. This could allow several medium helicopters to launch attack and surveillance drones into a given operational area, possibly in the enemy’s rear. Command and control, logistics, comms, armour, barracks, and hardened targets could all be engaged in this way. 

Forward-launched recce drones could provide target designation and satisfy positive ID requirements when operating under tight rules of engagement.

Such an approach could also overload the enemy air defence command and control and be usefully deployed in conjunction with simultaneous missile and/or manned aircraft operations.

This capability is alluded to in several planned US programmes, including the abandoned FARA and FLRAA. We are talking about air-launched effects (LE) for reconnaissance or attack and Future Tactical Unmanned Aircraft Systems. The air-launched effects were described (Vertiflite March / April 2024) as being deployed from FARA, FLRAA and Black Hawk “to decoy, disrupt or destroy enemy air defences and to spot targets for joint forces”. The same article indicates that ”the Army plans first flight of a fully-integrated ALTIUS – Air-Launched, Tube Integrated Unmanned System from a Black Hawk this year” potentially for a rapid fielding decision in 2025.

The US’s ”long-standing interest in technologies that enable a single operator to control multiple UAS is associated with this.”

pic.twitter.com/sbyvDYWw1c

— Hush-Kit Aviation News, History & Satire (@Hush_Kit) October 7, 2024

Perhaps network-enabled command and control, ISTAR, and other means of target verification can integrate existing AH capability in defensive operations. Medium helicopters operating further back could launch a mix of longer-range weapons and ‘Launched effect UAS’ in both offensive and defensive scenarios.

Further to the suggestion of stand-off medium helicopters for anti-armour ops over enemy territory (and the US reference to Air Launched Effects), see here.

It is also worth noting that Sea King was cleared for export customers to launch Sea Eagle (India) and Exocet (Qatar, Pakistan), suggesting plenty of payload for air-launched systems controlled by medium support helicopters. [A good role for the FAA Merlin Mk.4 force?]

The Drone Threat to Helicopters

In a traditional mechanised offensive, armour and infantry fighting vehicles (IFVs) operate collectively to gain and hold ground. Helicopters are used forward to take out enemy armour and attack command posts while scouting and designating targets for precision artillery strikes.

Infantry also relies on helicopter support for air cover and casevac. Recently, drones have been used in kamikaze attacks on helicopters. Used in this way, drones could significantly hamper helicopter operations and severely affect infantry morale.

Both helicopters and ground vehicles now need to adopt design and protection / defensive measures cognisant of the drone threat. In this scenario, the twin tail rotors suggested on some Westland designs (admittedly for other purposes) could provide a degree of redundancy.

General Observations

As the earlier discussion shows, the systems are more important than the platform. Ideally, you want to be network-enabled (so that someone else sorts out the targets and satisfies the rules of engagement). Then you want a long-range fire-and-forget weapon system capable of defeating enemy countermeasures and with a tandem charge, warhead to deal with ERA. If the missile sensor can discriminate between target types, so much the better. If I were in a tank, I’d still be worried about drones – as I said in a briefing a dozen years ago. 

Given the right network integration and the right weapons, you could inflict a deal of pain in a fairly basic helicopter while staying well out of the way of any air defence. You still have to protect yourself against chance encounters – partisans or special forces with shoulder-launched weapons, for example. This appears easier said than done.

Assuming conditions allow offensive aircraft operations, integrating western weapon systems such as Brimstone on suitable platforms, such as Frogfoot, could provide the ability to salvo fire against multiple targets. Its MMW radar seeker is supposed to support this capability, with the weapons themselves avoiding duplication of effort and allocating targets across the salvo (fire-and-forget en masse).

The capacity offered by a medium helicopter in this role could extend to area denial or countermobility operations. This type of platform might be used to deliver area denial or scatterable countermeasures (even mines, perhaps) to rapidly counter enemy armour. Missiles such as Brimstone might be more effectively employed in this scenario.

Whether in a defensive or offensive posture, an agile and responsive command and control system will be required to maintain a responsive decision-making process. This is known as the OODA-loop (OODA stands for observe, orient, decide, act). There is some question as to whether current NATO surveillance assets are providing near-real-time intelligence to Ukraine. It is clear, however, that long-range stand-off anti-armour operations will require a persistent (probably stealthy) high-flying or stand-off system to provide situation awareness, detect armour targets across the battlefield and enable the use of precision indirect fires (whether by artillery or helicopter, operations).

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One very good use case for low or zero sensors but good comms is to have airborne nodes in a ‘scrum half’ position behind the tactical edge. Anything up threat (exquisite and LO) can use directional comms to get data back / receive C2 and Intel from the nodes; the nodes then use any route to get to the optimal place – including space and terrestrial – from a position that cannot be easily targeted by OPFOR.

Urgent Operational Requirements manage rapid change during conflict, usually in response to painful lessons learned. This is generally at the subsystem/protection level rather than the system and platform level. Examples could be the rapid introduction of electronic countermeasures, protective screens, and responses to enemy countermeasures. The targeting infrastructure required to support helicopter indirect fire long-range attacks appears a little different from that required to support MLRS / HIMARS / ATACMS operations and should, therefore, be available, provided suitable tasking orders can be accommodated.

Interestingly, the available description of the Leonardo AW249 mentions the ability to operate air-launched RPVs. The latest Aerospace magazine indicates more on its network capability: “acts as a sensor ISR node on a C4 network, and (can) control and manage UAVs – with a Wide Band LOS Datalink … LTE Gateway and Link 16.” The articles do not address the routine concept of operations, but the connectivity and network capabilities could allow a range of collaborating systems to provide targeting data. Now they just need to adapt AW149 and/or NH90 TTH to the stand-off anti-armour role …”

Tentative Conclusions

There are many problems facing armoured units in modern land warfare. Broadly, these fall into

(1) threats: enemy armour, helicopters, armed drones, precision artillery and missiles, minefields and obstacles;

and (2) the difficulty of sustaining operations over time at long range: logistics – fuel, ammunition, repair, crew sustainment, rules of engagement.

Similarly, one can discuss the problems facing the counter-armour forces – again dependent on terrain/area of operations, posture, equipment and C4ISTAR systems and their connectivity. 

Operational changes may arise under TTPs (Tactics, Techniques, and Procedures) rather than wholesale doctrinal revisions. The challenge is to inflict heavy casualties on enemy forces while increasing one’s own chances of survival.

Used carefully, existing attack helicopters operating over ‘friendly’ terrain can still be effective. Increased use of ‘network-enabled warfare’ seems essential, combined with the ability to engage targets primarily at range and preferably non-line-of-sight.

You might end up with some new operational concepts and the reprioritisation of target lists.  Flooding of land to ‘canalise’ (literally and metaphorically) the routes available to armour (and logistics); out-of-contact launching and controlling of recce/designator / armed drones – and longer-range missiles from medium helicopters looks like a decent tactic for anti-armour operations and may have a place in both defensive and offensive postures.

Brimstone 2 (helicopter launched) has a stated range of 40 km+. As an operational concept, half a dozen AW149s (or NH90s, or Merlins, or Sea Kings), each with eight Brimstone 2, could do a lot of damage providing indirect fire—provided near real-time networked stand-off target information was available. In this role, the helicopter fleet operates as a highly mobile precision artillery force.

Exploitation of night capability and simultaneous attacks along a front might come into play. Deep strikes into enemy training and rear areas (and recruitment centres) might also be targeted to affect public opinion and morale.

Other options could include using dummy armour supported by signals deception activity to draw in enemy forces or distract from more covert operations.

Finally, it would appear that heavy armour forces do need organic close-in air defence. Perhaps the naval approach (e.g., Phalanx)—whether by high rate-of-fire radar-directed gun systems, electronic countermeasures (potentially including EMP to disrupt connectivity of control systems), or directed energy means—might go a good way to countering the ‘kamikaze drone’ threat. Target detection and tracking systems would have to be modified to suit the targets to be engaged. 

The low cost and simplicity of the drones mean that they have a significant number of advantages, and identifying and then defeating drones once in the air is hard; their low profile and low signature are a challenge, and their agility makes physical defeat hard. This strongly favours electronic countermeasures might be the preferred approach.

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The discussion suggests that intelligence, communications, and the ability to counter enemy operations are becoming dominant factors in future land warfare. Land platforms and helicopters should now be designed, considering enemy drone operations as a key threat.

Equally, friendly drone operations – offensive, defensive, intelligence gathering, defence suppression, etc. —should be integrated into and with operational planning and land and air platform capabilities.

RV Smith

Dr Ron Smith joined the British helicopter company Westland in 1975, working in Research Aerodynamics, and remotely piloted helicopters (before they were cool), and later became Head of Future Projects. He had a strong influence on the design of the NH90 helicopter, and was involved in the assessment of the Apache for Britain. He also explored a variety of exotic future technologies for Westland. One such exotic machine was a secret stealth attack helicopter.

Credit is also due to John Puddy, Robert Hopkins, Jeremy Smith, and Jim Smith for the valuable insights they provided.

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