FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 5. Nondestructive Inspection (NDI) | 7. Ultrasonic Inspection | 5-97. Leak Testing
9/8/98
b. Detection Distance. Ultrasonic energy
in the relatively low-frequency range of
30-50 KHz travels easily through air; there-
fore, an ultrasonic leak detector can detect
leakage with the probe located away from the
leak. The maximum detection distance de-
pends on the leakage rate.
c. Typical Applications. Some typical
applications for the ultrasonic leak detector on
aircraft are: fuel system pressurization tests, air
ducts and air conditioning systems, emergency
evacuation slides, tire pressure retention, elec-
trical discharge, oxygen lines and valves, in-
ternal leaks in hydraulic valves and actuators,
fuel cell testing, identifying cavitation in hy-
draulic pumps, arcing in wave guides, cabin
and cockpit window and door seals, and cabin
pressurization testing.
5-98.5-104. [RESERVED.]
AC 43.13-1B
Par 5-97
Page 5-51 (and 5-52)