horizontalpushrods.(Shownin Figure 402.) Securewithbolts and locknuts. (5.) Install cover plateandinsidehandle;adjustlugs.
3. LatchingMechanismAdjustment(Figure402)
(a) Removeinsidetrimpanelsandaccessplates.
(b)With door open, position handlein open position.
(c)
Checkallseven locking lugs and ensure all are evenwith ends of door lug guides.
(d)
Ifany lugs extend beyond the guides, orare inside the guides, loosenlocknutsonpushrod. Turnpushrodfor proper setting.
(e)
Place handle in closed position.Checkall seven lockinglugs for proper extension (approximately1.25inches).
(f)
If any lugsare out of adjustment, loosen locknuts onpushrod and adjustpush rod for proper extension.
(g)Check that all locknutson push rodsare tight, and all lugs and bellcranksoperatefreely.
(h) Replaceaccessplatesand trim panels.
EFFECTIVITY:
040-999
52-10-00PAGE
Jan 10/90 5
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
E. Cabin Door Auxiliary Lock
1. Cabin Door Auxiliary Lock Removal (Figure 402)
(a)
Remove knob from auxiliary lock rod extending through inside surface of entrance door next to handle.
NOTE: The interior trim panels must be removed to gain access to cover plate over lock mechanism.
(b)
Remove four screws securing cover plate; remove.
(c)
Remove cotter pin and washer from end of lock rod extending through lock bushing; remove rod.
(d)
Toremove lock bushing, plunger, and spring from door, loosen and remove two machine screws and nuts securing assembly to door.
2. Cabin Door Auxiliary Lock Installation (Figure 402)
(a) Install spring into plunger. Install plunger and spring into bushing.
NOTE: Ensure O-ring is installed in bushing around plunger.
(b)
Place assembly into access opening. Secure in place with two screws and nuts.
(c)
Install lock rod into slot in bushing and through hole in plunger. Secure in place with washer and cotterpin.
(d)
Installcover plate, ensuring lock rod extends out through bushing in cover.
(e)
Securecover to door with four screws. Replace trim panels on interior of door and knob on end of lock rod.
At Frame At Door
Cylinder
Snap Piston Snap Piston
Door Snubber Assembly
Figure 403
EFFECTIVITY:
040-999
Jan 10/9052-10-00
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
F. Cabin Door Snubber (Figure 403)
The snubber assembly is a hydraulic cylinder with an orifice type valve on the piston, which allows hydraulic fluid to pass at a predetermined rate during door opening sequence. When the door is being closed,the piston is forced into the cylinder, and the orifice valve opens to allow a faster flow rate of hydraulic fluid.
1. DoorSnubber Removal
(a)
With door extended, remove screws securing boot over lower end of snubber.
(b)
Removebolt and locknut securing lower end of snubber to cabin door.
(c)
Removebolt securing snubber assembly to bracket on door frame.
2.
Filling Snubber Assembly
With snubber piston collapsed into cylinder, remove plug on cylinder, fill with MIL-H-5606 hydraulic fluid, insert plug back into cylinder, extend piston from cylinder, and work piston in and out to help remove any trapped air in the cylinder. Collapse piston into cylinder, remove plug, add more fluid as required, and reinsert plug in cylinder.
3.
Door Snubber Installation
(a)
Install snubber to bracket on door frame with a bolt.
(b)
Installlower end of snubber into bracket on door. Secure with bolt and nut.
(c)
Secure boot over snubber connection on entrance door.
G.
Door Seal System (Figure 404)
The door seal system receives its pressure from the engine bleed air. The bleed air leaves the bleed port on both engines at a temperature of 600°F and a pressure of 90 psi, and travels to the intercoolerswhere the heat exchange process takes place. There bleed air is cooled and routed to check valves prior to entering the pressure regulator. The regulator decreasespressure from 90 psi to 18 psi. The line is then routed to a three way valve which directs the pressurized air to the door seal, or dumps the pressure when the door is opened.
1.
Door Seal Assemblies
This is an inflatable seal with an air inlet valve from the lower comer of the seal to a control solenoidvalve. A metal flange is installed around the seal to keep it in place. When the door is closed and the cabin is pressurized, the door seal is also pressurized and expands against the door frame to completely seal the door opening. 中国航空网 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(108)
