FLIGHT INSTRUMENTS MAINTENANCE OPERATIONAL CHECK
Tool Kit, Electrical
Tester, Pitot and Static
Armament/Electrical Systems Repairer (2)
Pitot and static
Refer to pilot station (fig. 839) and CPG station (fig. 840) 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).
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:
a. Check left and right static ports (fig. 841)
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. 841)
and check tubes for dirt or obstruction.
If Pitot tubes are obstructed or dirty clean tubes
c. Drain Pitot static system
If excessive water is found at drain cock, purge
system (TM 1-1500-204-23).