KIRANA HILLS, SARGODHA: THE COLD TESTS
Pakistan’s first cold test of its nuclear device was carried out on 11 March 1983 in the Kirana Hills near Sargodha, home of the Pakistan Air Force’s main air base and the Central Ammunition Depot (CAD). Cold Test (CT) is a means of testing the working of a nuclear device without a nuclear explosion and the resultant radiation. This is achieved by triggering an actual bomb by initiating a chain reaction but without the radioactive fissile material needed to detonate it. The test was overseen by Dr. Ishfaq Ahmed. ...
Also, during the 1983-1990 period, the Wah Group went on to design and develop an atomic bomb small enough to be carried on the wing of a small fighter such as the F-16. It worked alongside the PAF to evolve and perfect delivery techniques of the nuclear bomb including ‘conventional free-fall’, ‘loft bombing’, ‘toss bombing’ and ‘low-level laydown’ attack techniques using combat aircraft. Today, the PAF has perfected all four techniques of nuclear weapons delivery using F-16 and Mirage-V combat aircraft indigenously configured to carry nuclear weapons.
When Mountains Move: The Story of Chagai - Nuclear, Missile and Space Warfare - PakDef.org : Pakistan Military Consortium