Mooney M20TN, Service And Maintenance Manual

Page: 308 / 1169

MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 18
-- CAUTION --
Should be observed during installation for proper
placement of washers and bushings on the re-
traction system.
18. Re--install aircraft belly panels.
32--30--06 -- LANDING GEAR ACTUATOR, RE-
COILER SPRINGS/ CABLE AND DRUM ASSY RE-
PLACEMENT
1. Carefully separate pulley housing from recoiler as-
sembly (5) (Fig. 32--17) by removing screws (14). Re-
tain pulley on shaft.
2. Slide pulley drum and cable off shaft.
3. Remove two (2) recoiler springs (5B), and two (2)
of three (3) spring spacers (5C) leaving third spacer in
housing. Be certain that spacer is in place before instal-
lation of two (2) new recoiler springs and previously re-
moved spacers.
4. Install new recoiler springs placing a spacer be-
tween each spring and over top spring.
IMPORTANT – Recheck proper installation of springs.
NOTE:
When looking at recoiler assembly with shaft end
toward you, the spring tabs in the housing slot
should curve to the right as shown (Fig. 32--17).
5. Inspect cable for sheathing damage. Replace
cable if sheathing is cut or stripped. Measure overall
cable length prior to reassembly. Cable length should
be 31 1/2” +/-- 1/2” long.
6. Slide drum onto shaft and be certain that spring de-
tente on drum engages both recoiler springs by slightly
rocking drum end.
7. When full engagement is obtained, wrap cable
around drum in a clockwise direction--leaving 2” to 5” of
cable free of drum.
8. Align slot in pulley housing with cable and slide
pulley housing over cable and drum assembly.
NOTE:
Cable length in retract position may be adjusted
shorter or longer by holding clutch with the fin-
ger of one hand (to prevent shaft rotation), and
then with the other hand, rotating pulley housing
one (1) full turn CW (to shorten) or CCW (to
lengthen). Retention of clutch with finger will not
allow pretensioning of springs. Slight spring ten-
sion should be noted starting at 8” to 10”.
9. Holding housings together, pull properly aligned
cable several times to ensure the absence of binding
conditions. Measure cable length from side of housing.
At full extend, the length of cable should be 29” mini-
mum. In retracted position, cable length should be 5” to
8” long.
10. Bronze clutch (13) should be inspected for dam-
age or wear at slot where gear assembly engages dur-
ing manual extension of the landing gear.
11. If damaged or worn, remove pin (11) from disen-
gage arm (12) and slide disengage arm out so bronze
clutch (13) can be pulled from its driveshaft.
12. Replace bronze clutch and reassemble disen-
gage arm into recoiler assembly.
13. Attach clutch recoiler assembly to actuator gear
housing with the four (4) screws (3 & 4, Fig. 32--17) re-
moved in 32--30--05.
32--30--07 -- MANUAL EMERGENCY GEAR EX-
TENSION SYSTEM
The manual emergency gear extension system is used
to extend gear only. The controls are in the floorboard
aft and between the front seats. To manually extend
gear:
1. Landing gear actuator C/B – PULL.
2. Move landing gear control switch to DOWN posi-
tion.
3. Push latch on manual extension control forward
with right thumb.
4. Pull RED lever back and upward (engaging manu-
al extension system).
5. Pull “T” handle UP and return to original position;
continue until GREEN, gear--down indicator light on
annunciator is illuminated and/or lines on visual gear
position indicator, on floor, aft of console are aligned
when viewed from directly above indicator (this will nor-
mally take 12 to 20 pulls).
-- CAUTION --
DO NOT operate landing gear electrically with
manual extension system engaged. Landing gear
actuator C/B will pop out.
-- CAUTION --
DO NOT continue to pull T--Handle after GEAR
DOWN light is ON. Actuator may bind on Down
Stops.
32--30--08 -- FINAL CHECKS
1. Raise and lower landing gear through five com-
plete cycles, pausing after each cycle to check required
tolerances and dimensions, and annunciator light indi-
cations. Make certain no bungee springs are com-
pressed to solid height and nose gear tire clears top of
wheel well a minimum of .25 in. when landing gear is
retracted. Make adjustments per above procedures, as
required, to correct any deficiencies.
2. Retorque all jam nuts.
3. Re--attach main and nose landing gear door links.
Check to see that main and nose landing gear doors
are still rigged per paragraph 32--10--03 and 32--20--03.
32--30--06