Wrapping Of Trim Drums - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
C. Wrapping of Trim Drums
NOTE: The following instructions provide generalized instructions. For specific requirements as to
number and position of cable wraps on drum, refer to appropriate trim rigging procedure.
All trim drums, wrapped basically the same, must be removed from the airplane as follows:
1. For reference, mark end of drum toward base of housing bracket when later installing and
wrapping cable on drum.
2. With drum housing bracket held firmly, remove one of the cable guard bolts from housing bracket.
3. Remove drum screw or drum shaft from trim screw assembly. Remove screw by removing stop
located on end of screw opposite base of housing bracket. Turn screw from drum. Remove shaft
by driving roll pin from center of drum. Press shaft from drum.
4. Remove drum from housing.
5. Unwrap trim cable and remove cable and lockpin from drum. If one end of cable is marked to
facilitate hookup of cable ends, note location in relation to drum when installing new cable on
drum.
6. Check condition of bushing in housing bracket for excess wear.
7. To install and wrap trim cable, locate center of cable, measuring from end to end.
8. Insert center of cable into cable slot in drum; install lockpin.
9. Hold drum with previously marked or base end of drum down.
10. Looking down on drum, wrap cable leading from base end up in a counterclockwise direction.
Wrap cable from upper end down in a clockwise direction.
11. Insert drum in housing bracket, position drum, and route cables from assembly as shown in Figure 1.
12. Install screw and screw stop or drum shaft. Secure with roll pin.
13. Block trim cables in center position using method shown in Figure 2.
14. Center drum between stops on screw by rotating screw.
Screw Stop
Drum Screw
Bushing
Drum
Drum
Housing
Bracket
Roll
Pin
Cable
Lock
Pin
Bushing
Cable
Lock Pin
Bolt Attachment
Housing
Guard
Nuts
Bracket Base
Screw Stop
Trim Screw Assembly
Figure 1
EFFECTIVITY:
040-999
Jan
10/9027-00-00