TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
F.
AVIONICS FLIGHT CHECKS (CONT)
i.
Check roll command function of autopilot as follows:
(1) Turn control knob (autopilot pitch-turn control panel) - Turn to L and R and verify that autopilot
turns aircraft left or right respectively.
*2. Slaved compass systems - Check that systems agree with known magnetic headings within2° and
within 3° of each other.
*3. Inertial Navigation System Flight Test - Perform as follows:
Satisfactory performance shall be demonstrated by flying over three checkpoints whose latitude and longitude
are known, and comparing them with the inertial present position readouts. The aircraft shall establish a low
altitude, compatible with aircraft safety and applicable laws and codes of flight, which will allow accurate
sighting of ground landmarks. An altitude of 1000 feet over waypoints and 10,000 feet or more when between
waypoints is recommended whenever possible.
a.
Inertial navigation system - Set up, align, and operate in accordance with TM 55-1510- 220-10.
b.
TACAN update - Check as follows:
(1) Key 4 - Depress.
(2) INSERT/ADVANCE key - Depress. Key will dim.
4-10
