Adjustment Of Main Gear Up Light Switch; Adjustment Of Main Gear Down Light Switch; Adjustment Of Main Inboard Gear Door Ajar Switches - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
7-35. ADJUSTMENT OF MAIN GEAR UP LIGHT SWITCH.
a. Ascertain that the main landing gear uplock is properly adjusted.
b. Retract gear fully and ascertain that the uplock roller is engaged and resting on the uplock hook.
(No pressure on hydraulic system.)
c.
Adjust the gear uplock switch toward the link until it actuates. The amber indicator light in
cockpit should go out.
NOTE
Opposite main gear switch and nose gear switch must be actuated
also to extinguish amber light.
d. Extend and retract gear to ascertain proper adjustment.
7-36. ADJUSTMENT OF MAIN GEAR DOWN LIGHT SWITCH. (Refer to Figure 7-13.)
a.
Ascertain that the main landing gear downlock is properly adjusted.
b. With the gear down and locked, the green indicator light in the cockpit should come on when the
downlock hook is lowered to within .030 to .070 of an inch of bottoming in the hook slot of the lower side
brace link. The following check and adjustment may be accomplished:
1.
By hand, raise the downlock hook until the downlock switch is heard to actuate (click).
2.
With hook raised, place a .070 of an inch wire feeler gauge between the hook and bottom
surface of the slot in the side brace link. (Refer to Figure 7-13.)
3.
Lower the hook, allowing it to rest on the feeler gauge. (The end of the gauge should be
even with the lock pin.) The switch should not be heard to actuate.
4.
Again raise the hook, allowing the switch to actuate, and place a .030 gauge in the slot of
the side brace link.
5.
Lower the hook. The switch should actuate allowing the green indicator light in the cockpit
to come on.
6.
When lowering hook, if the switch actuates too soon, adjust the switch toward the hook. If
it actuates too late, adjust the switch away from the hook.
7-36a. ADJUSTMENT OF MAIN INBOARD GEAR DOOR AJAR SWITCHES.
a.
Ascertain that main inboard gear doors are adjusted properly.
b.
With the master switch off, actuate the hand pump to bring the gear doors down.
c.
Disconnect the actuator cylinder rod from the'doors so they hang free.
d.
Locate the switch by adjusting the retainer nuts so that when the door is closed by hand, a click can
be heard approximately one inch before the door is completely closed.
CAUTION
Avoid extreme outward adjustment that would cause the switch
mounting tab to bend back when the door is closed, resulting in
damage to the switch unit.
NOTE
An ohmmeter or continuity tester can be used to indicate switch
actuation.
Revised: 3/11/81 LANDING GEAR AND BRAKE SYSTEM
2E22