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20. Anti-ice systems | Up
TM-1-1520-238-MTF Maintenance Test Flight Manual Helicopter Attack
AH-64A Apache | Next
21. IHADSS – Boresight |
TM 1-1520-238-MTF
2-26
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
*e. Ice-detector – Have crewmember
touch tip. Verify ice severity meter
needle movement, ENG ICE cau-
tion/warning segment illuminated,
and detector heated. Release de-
tector and verify ENG ICE caution/
warning segment extinguished in
approximately 90 seconds.
*f. PITOT-AD SNSR anti-ice system –
Test as follows:
(1) ANTI-ICE panel PITOT AD
SNSR and ENG INLET
switches – ON. Verify ENG 1
ANTI ICE and ENG 2 ANTI ICE
caution/warning segments illu-
minate.
(2) Have crewmember touch pitot
tubes and nose gearbox
fairings to verify heating.
(3) ADSS switch – OFF. Have
crewmember touch sensor and
verify heating.
(4) Ice detector unit – Have crew–
member verify presence of PAS
air and that the exterior housing
is heated.
(5) Set pilot and CPG switches as
desired.
A12
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