CABIN DOORS

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TTP
B1-L1
ATA52
Cessna 172
B2-L1

Cabin door is installed on each side of the airplane. Each door has an outer sheet skin that is chemically bonded to an inner pan assembly. Each door has a latch assembly, an inside handle, a pair of external hinges, and a doorstop assembly.
Operation - The cabin doors open by the inside or outside handle, that is connected to internal components.
Cabin door latch is a two-part assembly latch base, external handle, spring-loaded latch bolt and pull-bar assembly, and a spring-loaded catch pin assembly. The interior handle base plate assembly is directly connected to the cabin door latch by an adjustable push rod assembly. This push rod assembly has two clamps attached 180 degrees apart on the main rod. These clamps operate a cable assembly that moves a cable pin from the top aft end of the cabin door into the aft top door sill.
Door latch exterior handle is extended when the cabin door is open. The handle is held in position by the spring-loaded latch catch engaged with the latch bolt through the hole in the bolt. The push rod assembly will move forward. The attached cable assembly will be retracted from the top door sill with the cable pin in a recess in the pin guide. The interior handle will move approximately 15 degrees aft of the vertical position.
Cabin doors close and latch by the internal or external handle connected with internal components.
Cabin door moves the catch pin over the actuator attached to the cover plate. The cover plate is on the rear door post. The catch pin disengages the latch catch from the latch bolt as the catch pin is moved forward. The latch handle extends and the pull-bar assembly compresses. The latch handle is pulled in and the latch bolt is moved on the latch striker. The latch striker is on the rear door post.
Push rod assembly moves aft and moves the cable pin from the pin guide in the door into the top aft door sill receptacle when the exterior handle is pushed flush with the fuselage skin. The interior door handle has moved from approximately 15 degrees aft of the vertical position to approximately 45 degrees forward of the vertical position. The interior handle pushed to the horizontal position, flush with the armrest, will overcenter the door latch.
Cabin doors key lock turns and moves the pin into the exterior latch handle when the cabin door is closed and the exterior latch handle is flush.
NOTE: It is possible to lock the cabin door when the exterior handle is used and the push rod assembly is not adjusted correctly. The rigging and adjustment procedures must be used to correctly adjust the push rod.
521001 Doors - Inspect general condition. Check latches, hinges, and seals for condition, operation, and security of attachment. B 05-12-01 210
521002 Passenger/Crew door retention system. Make sure you inspect these areas: 1. Bell
cranks. 2. Pushrods. 3. Handle. 4. Pin retention. 5. Pins. 6. Lockplates and guides.

7. Hinges. 8. Internal door framing

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