Flap Motor And Transmission Assembly; Drive Pulleys; Flaps - Cessna 150 STANDARD Service Manual

7-5. FLAP MOTOR AND TRANSMISSION ASSEM-
BLY.
1
7-6. REMOVAL AND INSTALLATION.
a. THRU AIRCRAFT SERIALS 15072629, F15000738,
A15000277 AND FA15000132 WHEN NOT MODIFIED
IN ACCORDANCE WITH SK150-37 AND WHEN NOT
MODIFIED IN ACCORDANCE WITH FIGURE 7-2,
SHEET 3. (Refer to figure 7-2, sheet 1.)
1. Run flaps to full DOWN position.
2. Disconnect battery cables at the battery and
insulate cable terminals as a safety precaution.
3. Remove access plates adjacent to drive pul-
ley and motor assembly on right wing.
NOTE
Remove motor (10), transmission (8), hinge
assembly (11) and actuating tube (5) from
aircraft as a unit.
4. Remove bolt (21) securing actuating tube (5)
to drive pulley (14).
5. Screw actuating tube (5) IN toward transmis-
sion (8) by hand to its shortest length.
6. Remove bolt (1) securing flap motor hinge
(11)
to wing. Retain brass washer between hinge and wing
structure for use on reinstallation.
7. Disconnect motor electrical wiring (9) at
quick-disconnects.
8. Disconnect electrical wiring at up-limit
switch (3).
9. Using care, work assembly from wing through
access opening.
10. Reverse the preceding steps for reinstallation.
If the hinge assembly (11) was removed from the trans-
mission (8) for any reason, ensure the short end of
hinge is reinstalled toward the top.
11. Complete an operational check as outlined in
paragraph 7-3 and re-rig system in accordance with
paragraph 7-16.
l
b. THRU AIRCRAFT SERIALS 15072629, F15000738,
A15000277 AND FA15000132 WHEN MODIFIED IN AC-
CORDANCE WITH SK150-37 AND WHEN NOT MODI-
FIED IN ACCORDANCE WITH FIGURE 7-2, SHEET 3.
(Refer to figure 7-2, sheet 2.)
1. Complete steps 1, 3 and 4 of subparagraph
"a."
2. Run flap motor to place actuating tube (5) IN
to its shortest length.
3. Complete steps 2, 6, 7, 8, 9, 10 and 11 of
subparagraph "a. "
I
c. BEGINNING WITH AIRCRAFT SERIALS 15072630,
F15000739, A15000278, FA15000133 AND ALL AIR-
CRAFT MODIFIED IN ACCORDANCE WITH FIGURE
7-2, SHEET 3. (Refer to figure 7-2, sheets 2 and 3.)
1. Complete steps 1 thru 7 of subparagraph "a. "
2. Disconnect electrical wiring at limit switches
(29 and 32). Tag wires for reference or reinstallation.
3. Complete steps 9 thru 11 of subparagraph
"a."
7-7. REPAIR. Repair consists of replacement of
motor, transmission, coupling, actuating tube and
associated hardware. Bearings in hinge assembly
may also be replaced. Lubricate as outlined in
Section 2.
7-4 Change 1
7-8. DRIVE PULLEYS. (Refer to figure 7-2.)
7-9. REMOVAL AND INSTALLATION.
a. Remove access plate adjacent to drive pulley
(14) in right Wing.
b. Unzip or remove headliner as necessary for
access to turnbuckles (index 4, figure 7-1), remove
safety wire and loosen turnbuckles.
c. Remove bolt (20) securing flap push-pull rod (15)
to drive pulley (14) and lower RIGHT flap gently.
d. Remove bolt (21) securing actuating tube (5) to
drive pulley (14) and lower LEFT flap gently. Retain
bushing.
e. Remove cable locks (13) securing control cables
to drive pulley (14). Tag cables for reference on re-
installation.
f.
Remove bolt (12) attaching drive pulley (14) to
wing structure.
g. USing care, remove drive pulley through access
opening, being careful not to drop bushing. Retain
brass washer between drive pulley and wing structure
for use on reinstallation. Tape open ends of drive
pulley after removal to protect bearings.
h. To remove left wing drive pulley, use this same
procedure omitting step "d. "
i.
Reverse the preceding steps for reinstallation.
Rig system in accordance with paragraph 7-16, safety
turnbuckles and reinstall all items removed for ac-
cess.
7-10. REPAIR. Repair is limited to replacement of
bearings. Cracked, bent or excessively worn drive
pulleys must be replaced. Lubricate bearings as out-
lined in Section 2.
7-11. FLAPS. (Refer to figure 7-3. )
7-12. REMOVAL AND INSTALLATION.
a. Run flaps to full DOWN position.
b. Remove access plates (1) from top leading edge
of flap.
c. Disconnect push-pull rod (6) at flap bracket (7).
d. Remove bolts (5) at each flap track. As flap is
removed from wing, all waShers, rollers and bush-
ings will fall free. Retain these for reinstallation.
e. Reverse the preceding steps for reinstallation.
If push-pull rod (6) adjustment is not disturbed, re-
rigging of system should not be necessary. Check
flap travel and rig in accordance with paragraph
7-16, if necessary.
7-13. REPAIR. Flap repair may be accomplished in
accordance with instructions outlined in Section 18.
7-14. CABLES AND PULLEYS. (Refer to figure
7-1. )
7-15. REMOVAL AND INSTALLATION.
a. Remove access plates, fairings, headliner and
upholstery as necessary for access.
b. If the direct cable (2) is to be removed, discon-
nect clamp (10) and slowly release indicator wire (11)
until spring (16) tension is relieved.
c. Remove safety Wire, relieve cable tension, dis-
connect turnbuckles (4) and carefully lower LEFT
flap.
d. Disconnect cables at drive pulleys, remove