Piper COMANCHE PA-24-180 Service Manual page 242

PIPER COMANCHE SERVICE MANUAL
FIGURE 6-21. LANDING GEAR DOWN SAFETY LOCK INSTALLATION
6-59. Adjustment Of Landing Gear Down Safety Lock. The purpose of the gear down safety lock is :o
provide an additional means to retain the gear retraction torque tube assembly in the down position with the
gear transmission disengaged (emergency extension condition). Landing forces are absorbed by the over
center mechanism held in position by springs at each gear and are not intended to be transferred to the
FIGURE 6-21. LANDING GEAR DOWN SAFETY LOCK INSTALLATION
6-59. Adjustmt Of Landing Gear
own afety ock
by the following p
urpose of the gear down safety lock is :o
provide anPlac additional
meirplans to ren
the gear retraction torque
tube assembly in the down position
.)with
the
ear transm
isconnect
(e retract
tnsion ns
condition ). Landing on
the
emergency release le over
center mechanism he down safety lockn by springshould
be adjust eah gear and
a close to the spacer () on te transferred toarm thru
push-pull rod and cables.
bolt (2) as possible, yet freely engage when the ear is properly adjusted.
.
To adjust t
he lock removecottern
loosen jam nut(6)and turn
lock by the following procedesire
direction.
5.
If one-half turn is needed for correct adjustment, remove bolt (10) attaching lock fitting (8)
to the bulkhead bracket and turn fitting in the desired direction.
6.
Install fitting and spring (9) in the bulkhead bracket and secure with bolt.
7.
Tighten jam nut, install cotter pin and safety wire attachment bolt head.
c.
Check the gear down safety lock by using the following procedure:
I.
Install the emergency gear extension lever in the torque tube socket, making sure it is properly
seated and fully extended.
2.
Attach an accurate spring scale (0 to 100 pound range) to the bottom of the extension lever
knob.
3.
Pull out the gear motor circuit breaker and turn on master switch.
4.
Disengage the down safety lock and measure force on the extension lever by pulling
horizontally aft on the spring scales until the gear downlock light goes out.
5.
Engage the down safety lock and make the same force measurement with the addition of 35
pounds to the first measurement.
6.
The gear downlock light should remain "ON."
7.
If the gear downlock light goes out. check adjustment of the landing gear retraction system
per Paragraph 6-51.
ISSUED: 8/18/72
1K2
LANDING GEAR AND BRAKE SYSTEM
1K2