Radio altimeter

TM 1-1510-223-MTF

PROCEDURE

TROUBLESHOOTING

REFERENCE

NOTE

If the RUDDER BOOST annunciator is illuminated,

yaw damper and rudder boost will not engage.

(9) Radio altimeter - Check valid on EADI.

NOTE

To perform the following checks, the air data

computer must be valid and less than 60 knots, and

the radio altimeter must be valid and less than 50

feet. These conditions must be satisfied to avoid

tripping the autopilot servo monitors while

overpowering the autopilot servos.

(10) Control wheel - Move to mid-travel.

(11) AP ENGAGE switch-indicator (autopilot

controller) - Depress to engage

autopilot and yaw damper. Check that

AP ENGAGE and YD

ENGAGE

switch-indicators on the autopilot

controller and the remote annunciators

on the instrument panel are illuminated.

Autopilot elevator trim follow-up - Check as

follows:

(1) Control wheel - Hold aft of mid-travel.

(2) Trim wheel (autopilot controller) -

Should

run

nose

down

after

approximately 3 seconds.

(3) TRIM

annunciator

(autopilot

controller) - Check illuminated after 6 to

8 seconds.

2-21