TM 1-1520-238-T-5
8–163
8–91.
FLIGHT INSTRUMENTS – MAINTENANCE OPERATIONAL CHECK
8–91
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Tester, Pitot and Static
S6-21312
System
Personnel Required:
68X
Armament/Electrical Systems Repairer (2)
References:
TM 1-1520-238-T-4
TM 1-1520-238-T-6
TM 11-1520-238-23-2
TM 1-1520-238-23
TM 1-1500-204-23
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Helicopter safed
External power
application –
Electrical
Pitot and static
system tester
connected
TM 1-1520-238-T-4
Maintenance headset
connected
NOTE
Refer to pilot station (fig. 8–39) and CPG station (fig. 8–40) for
configuration and equipment.
If referenced out of one paragraph or volume into another for additional
troubleshooting, upon completion of the task, return to the maintenance
operational check for the original paragraph or volume.
When operating the helicopter in high humidity, rapid change of
temperature or at any time that line blockage is suspected, purge Pitot
and static system (TM 1-1500-204-23).
WARNING
Do not apply Pitot heat during this operation. To do so could result in
severe burns to anyone touching the Pitot tubes.
1. Perform visual check of pilot and CPG flight instruments (TM 1-1520-238-23).
2. Complete the maintenance operational check as follows:
Task
Result
a. Check left and right static ports (fig. 8–41)
for dirt or obstruction.
If static port(s) are obstructed or dirty, clean static
port(s) (TM 1-1500-204-23).
b. Remove covers from Pitot tubes (fig. 8–41)
and check tubes for dirt or obstruction.
If Pitot tubes are obstructed or dirty clean tubes
(TM 1-1500-204-23).
c. Drain Pitot static system
(TM 1-1520-238-23).
If excessive water is found at drain cock, purge
system (TM 1-1500-204-23).
