An airfield cannot be hidden, cannot be moved, and cannot be replaced quickly. That combination is why it is the target, and why the weapon built for it is designed to be released from somewhere the defending air force would rather you were not.
On 23 September 2026, the Ministry of Defence signed a contract with Bharat Dynamics Limited for 160 Satellite Smart Anti Airfield Weapons (SAT-SAAW) and associated equipment for the Indian Air Force, at a cost of ₹810.79 crore. The contract was signed in New Delhi in the presence of Defence Secretary Rajesh Kumar Singh, under the Buy (Indian – Indigenously Designed, Developed and Manufactured) category. Delivery is scheduled between 2027-28 and 2028-29.
What the weapon is
SAT-SAAW is an air-to-ground precision guided glide bomb, designed and developed indigenously by the DRDO. It can be launched from the Jaguar, the Hawk and the Su-30 MKI, and is intended to neutralise enemy airfields from a long stand-off range.
Take the description apart, because each phrase is a distinct technical claim.
Glide bomb. A conventional bomb falls on a ballistic path determined by the aircraft's speed and altitude at release. A glide bomb has wings — usually folding surfaces that deploy after release — which convert some of its falling energy into forward travel. It has no engine. It is not a missile; it is a bomb that trades altitude for distance. The exchange rate is the glide ratio: a weapon with a glide ratio of ten travels roughly ten units forward for every one it descends, so releasing at higher altitude buys more range. This is why a glide weapon's reach depends on the launching aircraft's altitude and speed in a way a powered missile's does not.
Precision guided. The bomb steers. "Satellite" in the name refers to satellite navigation guidance — the weapon knows where it is from a navigation satellite signal and where it is supposed to go from a pre-loaded coordinate, and moves its control surfaces to close the gap. This produces a weapon whose accuracy is essentially independent of release range, which is the defining property of the whole class.
Stand-off range. The distance from which a weapon can be released without entering the defended area around the target. This is the entire point, and it is worth stating in terms of what it avoids. An airfield worth attacking is an airfield worth defending, with surface-to-air missiles and guns positioned around it. An aircraft that must fly over the target to bomb it enters that envelope. A stand-off weapon lets the aircraft release and turn away outside it. The weapon is expendable; the aircraft and its pilot are not.
The indigenous content will be 60 per cent, with sub-systems specifically indigenised including the inertial measurement unit, the long impact delay fuse and the twin store carrier.
Those three are worth understanding rather than skipping.
An inertial measurement unit contains accelerometers and gyroscopes and tracks the weapon's movement by measuring its own acceleration and rotation. It needs no external signal, which matters because satellite navigation can be jammed or spoofed. A weapon with both satellite guidance and an inertial unit can continue to a coordinate on inertial data alone if the satellite signal is lost — degraded in accuracy, but not blind. Pairing the two is standard practice for exactly this reason, and it is why indigenising the inertial unit is more significant than its size suggests.
A long impact delay fuse does not detonate on contact. It allows the weapon to penetrate first and explode afterwards. Against a runway this is the difference between scorching the surface and cratering the sub-base beneath it — a surface burn is swept and patched in hours, while damage below the pavement requires excavation and re-laying.
A twin store carrier is the pylon adapter that lets one hardpoint on the aircraft carry two weapons instead of one. It sounds like hardware trivia. It doubles the number of aimpoints a single sortie can attack, which for a weapon designed to close a runway is the whole tactical question.
Why airfields
Air campaigns have targeted airfields since air forces existed, and the reasoning is arithmetic rather than doctrinal preference.
Destroying an aircraft in the air requires finding it, reaching it and defeating its defences, one aircraft at a time. Destroying a runway denies every aircraft that needs it, simultaneously, without any of them having to be found. A modern fighter needs a considerable length of prepared, load-bearing, debris-free surface to take off with a useful weapon load. Deny that and the aircraft are intact, fuelled, armed — and on the ground.
The effect is also temporary, which is what makes the timing matter. Runway repair is a rehearsed engineering task, and a well-equipped air force restores a cratered runway within hours. So airfield denial is not about permanent destruction. It is about creating a window in which the adversary's air force cannot generate sorties, and using that window. A defender's counter-measures follow the same logic: rapid runway repair teams, hardened aircraft shelters, dispersal to secondary airfields, and the use of highway airstrips.
This is also why the number in the contract is as informative as the capability. One hundred and sixty weapons, against the many aimpoints needed to close a single airfield, is a stock for a limited number of such operations. Precision munitions are consumed far faster in an actual conflict than peacetime procurement plans assume, and inventory depth — not capability alone — is what determines how long a campaign can be sustained. Our explainer on the loitering munition contracts covers the same problem from the other end of the precision-weapons spectrum.
The procurement category, and how it differs from yesterday's
The contract was signed under Buy (Indian – Indigenously Designed, Developed and Manufactured), usually written Buy (Indian-IDDM). This is the highest-priority category in the Defence Acquisition Procedure, and the priority order is asked directly:
- Buy (Indian-IDDM) — indigenously designed, developed and manufactured, with a minimum of 50 per cent indigenous content
- Buy (Indian) — manufactured in India, with an indigenous content threshold, but the design need not be Indian
- Buy and Make (Indian) — an Indian vendor manufactures under transfer of technology from a foreign partner
- Buy (Global – Manufacture in India) — a foreign vendor supplies, with manufacture in India
- Buy (Global) — outright purchase from abroad
The categories are ranked by how much of the value and capability stays in India, and a requirement must be examined against the higher categories before a lower one can be adopted.
The distinction that matters most, and which candidates most often blur, is between design and manufacture. Buy (Indian) can be satisfied by an Indian factory building a foreign design. Buy (Indian-IDDM) requires the design itself to be Indian — which is why the DRDO's authorship of SAT-SAAW is what makes this contract IDDM rather than merely Indian.
This sits directly alongside yesterday's explainer on the auxiliary power unit contract under Make-II, and together the two cover the DAP's structure. The Make categories are about who funds development — Make-I with government money, Make-II at the industry's own risk. The Buy categories are about where the product comes from once it exists. A system typically passes through a Make or a DRDO development route and is then procured under a Buy category. Learning them as one tree rather than two lists is what makes the whole scheme answerable.
Bharat Dynamics Limited is the Defence Public Sector Undertaking specialising in missiles and guided weapons, headquartered at Hyderabad, and the standard production agency for DRDO-designed munitions. The DRDO designs; BDL builds. That division — a government laboratory as designer and a DPSU as producer — is the classic Indian model, and our piece on the review of defence public sector undertakings sets out how it is changing as private firms take a larger share.
🔑 Revision block
- The contract: ₹810.79 crore, signed 23 September 2026 at New Delhi, in the presence of Defence Secretary Rajesh Kumar Singh
- Vendor: Bharat Dynamics Limited (BDL), a DPSU specialising in missiles and guided weapons
- Designer: DRDO
- Item: 160 Satellite Smart Anti Airfield Weapons (SAT-SAAW) with associated equipment, for the Indian Air Force
- Category: Buy (Indian – Indigenously Designed, Developed and Manufactured)
- Indigenous content: 60 per cent
- Sub-systems indigenised: inertial measurement unit, long impact delay fuse, twin store carrier
- Launch platforms: Jaguar, Hawk, Su-30 MKI
- Delivery: 2027-28 to 2028-29
- Glide bomb: wings but no engine; trades altitude for forward distance; range depends on release altitude and speed
- "Satellite" in the name: satellite navigation guidance to a pre-loaded coordinate
- Stand-off range: release from outside the defended envelope around the target
- Inertial measurement unit: accelerometers and gyroscopes; needs no external signal, so it continues guidance if satellite navigation is jammed or spoofed
- Long impact delay fuse: penetrates before detonating, damaging the runway sub-base rather than only the surface
- Twin store carrier: allows one hardpoint to carry two weapons, doubling aimpoints per sortie
- DAP priority order: Buy (Indian-IDDM) → Buy (Indian) → Buy and Make (Indian) → Buy (Global – Manufacture in India) → Buy (Global)
- Buy (Indian-IDDM) minimum indigenous content: 50 per cent, with Indian design required
- Make versus Buy: Make categories concern who funds development (Make-I government-funded, Make-II industry-funded); Buy categories concern the source of the finished product
🎯 Practice MCQs
Q1. The September 2026 SAT-SAAW contract was signed with: (a) Hindustan Aeronautics Limited (b) Bharat Dynamics Limited (c) Bharat Electronics Limited (d) Bharat Earth Movers Limited
→ (b) — the DPSU specialising in missiles and guided weapons.
Q2. A glide bomb differs from a missile in that it: (a) Is unguided (b) Has no engine and trades altitude for forward range (c) Cannot be released from an aircraft (d) Is always larger
→ (b) — guidance is a separate question from propulsion.
Q3. "Stand-off range" refers to the ability to: (a) Keep a weapon in storage for extended periods (b) Release a weapon from outside the defended envelope around the target (c) Halt a weapon in flight (d) Launch without satellite guidance
→ (b) — the aircraft and pilot stay outside the air-defence envelope.
Q4. An inertial measurement unit is valuable in a guided weapon because it: (a) Increases the warhead yield (b) Extends the glide ratio (c) Continues to provide guidance if satellite navigation is jammed or spoofed (d) Reduces the weapon's weight
→ (c) — it measures the weapon's own acceleration and rotation, needing no external signal.
Q5. A long impact delay fuse is used against a runway in order to: (a) Detonate before impact for wider blast coverage (b) Penetrate the surface and damage the sub-base beneath it (c) Reduce collateral damage (d) Allow the weapon to be recovered if unused
→ (b) — surface damage is patched in hours; sub-base damage is not.
Q6. In decreasing order of priority, the first category under the Defence Acquisition Procedure is: (a) Buy (Indian) (b) Buy and Make (Indian) (c) Buy (Global – Manufacture in India) (d) Buy (Indian-IDDM)
→ (d) — a requirement must be examined against higher categories before a lower one is adopted.
Q7. The essential difference between Buy (Indian-IDDM) and Buy (Indian) is that: (a) IDDM requires the design itself to be Indian (b) IDDM permits foreign vendors (c) Buy (Indian) requires higher indigenous content (d) Buy (Indian) applies only to aircraft
→ (a) — Buy (Indian) can be satisfied by an Indian factory building a foreign design.
Q8. The minimum indigenous content required under Buy (Indian-IDDM) is: (a) 30 per cent (b) 40 per cent (c) 50 per cent (d) 70 per cent
→ (c) — this contract's system will have 60 per cent.
Q9. Attacking an airfield rather than individual aircraft is militarily efficient principally because: (a) Aircraft on the ground are easier to destroy than aircraft in the air (b) Denying the runway denies every aircraft that needs it, without each having to be found (c) Airfields are undefended (d) Runways cannot be repaired
→ (b) — runway denial creates a window, since repair is a rehearsed task.
Q10. Consider the following statements: 1. A twin store carrier doubles the number of aimpoints a single sortie can engage. 2. The Make categories of the Defence Acquisition Procedure concern who funds development, while the Buy categories concern the source of the finished product. Which is/are correct? (a) 1 only (b) 2 only (c) Both 1 and 2 (d) Neither 1 nor 2
→ (c) — learning them as one tree rather than two lists is what makes the scheme answerable.
📋 How this gets asked (PYQ pattern)
Defence procurement and weapon systems together form one of the densest scoring areas in the NDA general ability paper, and both halves of this contract are examinable.
The category question is the highest-value item here. The five Buy categories in priority order, and the design-versus-manufacture distinction between IDDM and Indian, are asked directly and are easy to invert under pressure. Learn the order once, learn that the ranking follows how much stays in India, and the question answers itself.
The organisation question separates the DPSUs, and they are confused constantly. BDL makes missiles and guided weapons; BEL makes electronics and radars; HAL makes aircraft and helicopters; BEML makes heavy vehicles and equipment; GRSE, MDL, GSL and HSL build ships. Four letters each, four distinct products.
The platform question asks which aircraft carries what. Jaguar, Hawk and Su-30 MKI for this weapon — worth noting that the Hawk is an advanced trainer, so its inclusion signals that the weapon is light enough for a trainer-class aircraft to carry.
The technology question asks what a term means: stand-off, precision guided, glide bomb, inertial navigation. Short, correct definitions are enough, and the glide-bomb-versus-missile distinction is the one most worth having crisp.
For the SSB interview, this contract supports a good answer on self-reliance. A candidate who explains that the significant fact is not the ₹811 crore but that the design is Indian — and that indigenising the inertial measurement unit matters because it removes a dependency in exactly the sub-system an adversary would try to jam — is talking about capability rather than reciting a headline. That distinction is what the interview is testing.
Preparing for NDA? Procurement categories are learnt once and then pay off on every contract you read afterwards. Build the base with our NDA general ability notes, follow the daily NDA current affairs, and prepare with our faculty in the upcoming Cavalier courses in Delhi.
✍️ Written by Maj Sunil Chopra — Co-founder and defence studies faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk.