Landing Gear Light Switches; Adjustment Of Nose Gear Up Light Switch; Adjustment Of Nose Gear Downlight Switch; Adjustment Of Main Gear Up Light Switch - Piper Navajo PA-31 Service Manual

7-30. LANDING GEAR LIGHT SWITCHES.
7-31. ADJUSTMENT OF NOSE GEAR UP LIGHT SWITCH.
a. Ascertain that the nose landing gear uplock is properly adjusted.
b. Retract gear fully and ascertain that the uplock roller is engaged and resting against the uplock
hook. (No pressure on hydraulic system.)
c. Adjust the gear uplock switch toward the hook until it actuates. The red indicator light in
cockpit should go out.
NOTE
Main gear up switches must be actuated also to extinguish red
light.
d. Extend and retract to ascertain proper adjustment.
7-32. ADJUSTMENT OF NOSE GEAR DOWNLIGHT SWITCH.
a. Ascertain gear is properly adjusted for downlock position.
b. With gear down and locked, adjust gear down switch toward the link until it actuates. The green
indicator in cockpit should come on.
c. Check switch operation by partially retracting and extending gear several times.
7-33. 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.
7-34. ADJUSTMENT OF MAIN GEAR DOWN LIGHT SWITCH. (Refer to Figure 7-11.)
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 7-11.)
Reissued: 10/12/79
LANDING GEAR AND BRAKE SYSTEM
PIPER NAVAJO SERVICE MANUAL
2F15