The sprawling complex at Kamra, west of Islamabad, reverberates at the thundering take-off of a Mirage Rose-1, the latest ageing fighter jet to have been gutted and reassembled by the Pakistani Air Force.
Fifty years after Pakistan bought its first Mirages, many planes in the venerable fleet are still being patched up, overhauled and upgraded for use in combat, years after conventional wisdom dictates they should be grounded.
That includes one of the first two planes originally purchased from France's Dassault in 1967, which was in a hangar at Kamra after its record fifth overhaul when AFP visited recently.
The techniques they have developed are reminiscent of -- but far more high-tech and lethal than -- the improvised methods used to keep classic American cars running on the streets of Havana.
"We have achieved such a capability that our experts can integrate any latest system with the ageing Mirages," says Air Commodore Salman M. Farooqi, deputy managing director of the Mirage Rebuild Factory (MRF) at the Kamra complex.
Pakistan bought its first Mirages to diversify its fleet, which in the late 1960s largely consisted of US-built planes: F-104 Starfighters, T-37 Tweety Birds and F-86 Sabres.
The Mirage became a popular choice, with the Air Force buying 17 different variants in later years, eventually owning the second-highest number of the fighter jets after France.
They performed bombing missions during Pakistan's failed war with India in 1971 -- one of the shortest conflicts in history, lasting just 13 days and leading to the creation of Bangladesh.
But Mirages flew on, also carrying out reconnaissance missions in India, and intercepting and shooting down Soviet and Afghan planes that violated Pakistani airspace during the Soviet war.
Usually the jet has two or three life cycles, each spanning around 12 years. But overhauling them abroad was expensive for Pakistan, a developing country whose budget is already disproportionately tilted towards its military and which has historically received billions in military assistance from countries such as the US.
So, with the help of experts from Dassault, the air force decided if you want something done for the right price, you've got to do it yourself.
The Mirage Rebuild Factory was established at the Pakistan Aeronautical Complex (PAC) in 1978, and in the years since has saved "billions" of dollars for Pakistan, according to Group Captain Muhammad Farooq, in charge of one of the maintenance hangars -- though he said the exact figure was difficult to pin down.
The planes take some seven weeks to be overhauled and repainted, he said, adding that usually the MRF has the capacity for more than a dozen planes a year. Its calendar for the next decade or so is already booked up.
At least eight different Mirage variants, including the Mirage 5-EF, Mirage III-DP and Mirage-III Rose-I, were in one of the maintenance hangers when AFP visited.
Engineers and technicians were dismantling cockpit instrument panels and landing gear while undertaking a "non-destructive inspection", essentially an X-ray to detect faults in the wings and airframe.
Dozens of engines awaiting overhaul were piled in one hangar. Even planes that had suffered accidents such as fires breaking out have been patched back together at the facility.
Pakistan has also been buying up discarded Mirages from other countries to bring through the facility, said retired Air Marshal Shahid Lateef.
The most important technological improvement, developed with the help of South Africa, is the ability to integrate air-to-air refuelling, Farooqi said.
The "identification of friend and foe" (IFF) system, which detects when a Mirage has been locked on to by the system of another plane, was also a key development, he said.
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