巴基斯坦跟美國有簽訂EUMA的協定，銷售到外國的F-16都有相關防盜保密裝置:
http://taiwanbbs.org/cgi/index.pl?b...212029320#r1219

The US personnel stationed at Jacobabad will be transitional. They will be training PAF aircrew on the maintenance of the Block 52. Most of these US personnel will be from Lockheed Martin. The US does not need to have personnel physically present in Jacobabad to monitor the Block 52s.

They have ways of keeping an eye on the Block 52s without being personally present. The main concern is the transfer of cutting-edge technology – the avionics and radar, the Joint Helmet Mounted Cueing System (JHMCS) the Sniper pod. They have put digital seals all the sensitive technologies, which can only be opened via a code, which only they know. If there is a malfunction or these parts need to be serviced, they will be taken out of the Block 52s and shipped back to the US for repairs/servicing. If we try to pry open these systems without the codes, inbuilt alarms will be relayed to the Americans, which will be a breach of the contract.

（Q 31: Will the Americans be able to track the locations of the Block 52s through some sort of tracking devices hidden inside the aircraft?）

A: If there are tracking devices then they will be inside the sealed systems, like the avionics suites or the sniper pods because we will not have the ability to look inside. If their Predator and Reaper drones are transmitting their GPS locations via satellite so can a Block 52 F-16.

Even though Turkey produces the F-16, there are some components that are manufactured in the US and only come to Turkey for the final assembly. In one incident, a Turkish Block 50 crashed and the pilot was killed. They salvaged the wreckage and laid it out in hanger and started putting together the pieces to find out the cause. They found a piece of sealed equipment which had cracked open and inside they found some device that looked like a bug. Upon inquiry, it turned out to be a tracking device.

除此之外，我記得美方還要求F-16C/D不准佈署到有佈署JF-17戰機作戰單位的基地去，就是刻意防範中國方面的窺探。即使是這樣，也難保巴基斯坦會不會將中國技術人員偷渡進去，前些日子美國指控巴國同意義中國技術人員去檢視那麼謎樣的匿蹤直升機殘骸，巴國方面則是強烈否認，只是誰都知道，此地無銀三百兩........