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A. Main (continued) NOTE: The shaded parts, time delay plunger (2), landing 12. gear selector spool (19) and manifold (35) are matched, lapped parts. It it is necessary to 47 replace any of these parts, replace them with a matched assembly containing (2), (19) and (35). 13- Shaded parts, transfer sleeve (7), and spool (10) 14. are also matched and lapped parts and must be replaced by a matched assembly containing (7) and (10). 42 46
1. TimeDelay Valve 17. Landing Gear Selector Spool 33. O-Ring
2. Plunger, Time Delay 18. O-Ring 34. Fitting
3. Spring 19. Spool, Landing Gear Selector
21. HandleDetent Assembly 37. O-Ring
6. TransferValve 22. O-Ring
7. Sleeve,Transfer 23. Plunger
8. O-Ring,Sleeve 24. O-Ring
9. Door Selector Spool 41. Fitting
10. Spool, Door Selector
11. Door Solenoid Valve Assembly
43. Insulating Plate 28. Fitting
13. O-Ring, Solenoid 29. O-Ring
14. Spring,Plunger Return 30. Backup
16. Pin 32. Fitting 47. Wire, Safety
48. Strap, Plastic Power Pack Manifold Figure 404
040-999 29-10-00 Jan10/90 PIPER AIRCRAFT
PA-42-720 (Advanced Tralner) MAINTENANCEMANUAL A. Main (continued) 21.Disassemblyof Manifold. (Figure 404) (continued) (f) Removelanding gear handle-release
retainer, spring, and plunger from manifold. The plunger end has a ball which must remain in place.
(g) Removecaps and fittings; wash manifoldin cleaning solvent (Federal Specification PS-661or equivalent)and dry with filtered, compressedair. Ensure internal passagesare clean. Reinstallcaps on fittings.
22.Assemblyof Manifold. (Figure 404) (a) Lubricateand install O-ring on landing gear selector spool. Install O-ring into manifold at opposite end.
NOTE: The landing gear selector spool, time delay valve plunger, and manifold are matched, lapped parts, and must be replaced as an assembly only.
(b) Insert selector spool into manifold from landing gear handle end of manifold. Insert only until selector spool taper is protruding approximately0.06 inch out manifold end.
NOTE: If selector spool is not protruding approximately opposite 0.06inch out of manifold, rack, when installing into body (see Figure 405), gear will not engage in proper position. Do not move selector spool more than 0.12 inch out of manifold, opposite rack. The O-ring could get caught and damaged, necessitatingreplacement. (c) Ensure landing gear selector spool slides freely.
(d) Ensure door solenoid spool moves freely within transfer sleeve.
NOTE: The spool and transfer sleeve are matched, lapped parts and must be replaced as an assembly only.
(e) Lubricatefour O-rings and install on transfer sleeve.
(f) Install transfer sleeve into manifold.
(g) Attach plunger to door selector spool with pin and install into transfer sleeve.
1.Manifold 2.Gear 3.ReturnCam
Indexingof Selector Spool Figure405 EFFECTIVITY: 040-999 PAGE16 29-1000 Jan 10/90
PIPERAIRCRAFT PA-42-720(AdvancedTrainer) MAINTENANCE MANUAL
A. Main (continued) 22.Assemblyof Manifold. (Figure 404) (continued) (h) LubricateO-ring(MS 28775-018) and install on solenoid.
(i) Lubricatedoor solenoid threads, insert plunger return spring into plunger cavity, and screw assemblyinto manifold. Torque to 70 inch-pounds.
(j) Install time delay plunger and spring into manifold.
(k) LubricateO-ring,installonto screw, and mount time delay assembly into manifold. Screw must be flush with outside of manifold.
23. Installationof Manifold. (Figure 404) (a) LubricateO-rings and install on five transfer sleeves.
(b) Insert transfer sleeves into manifold.
(c) Mate manifold to power pack body, being sure not to damage O-rings on transfer sleeves.
NOTE: When mating manifold with power pack body, index landing gear selector spool rack with input shaft gear (Figure 405). With landing gear selector spool protruding 0.06 inch from face A of manifold and input shaft return cam in horizontal position, tooth of input shaft gear must match with tooth space in landing gear selector spool rack. www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 2
