Editing Lockheed AC-130 (section)

===Upgrades===
[[File:AC-130U Sensor Operator.jpg|thumb|left|AC-130U sensor suite]]
During the Vietnam War era, the various AC-130 versions following the Pave Pronto modifications were equipped with a [[magnetic anomaly detector]] system called Black Crow (designated AN/ASD-5), a highly sensitive passive device with a [[phased-array]] [[Antenna (radio)|antenna]] located in the left-front nose [[radome]] that could pick up localized deviations in the [[Earth's magnetic field]] normally used to detect submerged [[submarine]]s. The Black Crow system was [[master/slave (technology)|slaved]] into the targeting computers of the AC-130A/E/H, enabling the detection of the unshielded [[ignition coil]]s of North Vietnamese trucks hidden under dense jungle foliage along the [[Ho Chi Minh trail]]. It could also detect hand-held transmitter signals of air controllers on the ground to identify and locate targets.

The PGM-38/U enhanced 25&nbsp;mm [[high-explosive incendiary]] round was created to expand the AC-130U gunships' mission in standoff range and survivability for its 25&nbsp;mm [[GAU-12 Equalizer|GAU-12/U]] gun. This round is a combination of the existing PGU-25 HEI and a M758 fuze designated as FMU-151/B to meet the MIL-STD-1316. The FMU-151 has an improved arming delay with multisensitive range.<ref>"PGU-38/U 25mm Ammunition", August 1993, Alliant Techsystems, Public Release, Case No. 93-S3040, E10630 8/93.</ref>
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