TM 55-1520-240-23-3
4-159
LEAK TEST FADEC P3 SIGNAL LINE
(Continued)
4-159
NOTE
This procedure must be accomplished
whenever the powerplant, Digital
Electronic Control Unit (DECU),
Hydromechanical Assembly (HMA),
or the drain cartridge are changed; or
when the P3 system is breached.
1.
Disconnect the P3 hose (1) from P3 tee (2) on
the HMA (3).
2.
Install compressed air source (or nitrogen
(E248)) hose (4) in P3 hose (1).
3.
Open the supply valve (5) on the pressure source
and slowly increase the pressure to 100 psi.
4-518
