6 52 fcom sa227 doors

AIRCRAFT SYSTEMS

DOORS SA227‐ SERIES/FCOM/VTM 6.52.1 PASSENGER ENTRANCE DOOR

The passenger entrance door is located on the left side forward of the prop plane and is of the air stair type. The latch mechanism is capable of being operated from inside or outside of the aircraft and is equipped with a key operated locking device. A warning light located on the instrument panel indicates the status of the door latches.

A patented latch mechanism (click‐clack) provides carry‐through structure when the door is closed on earlier aircraft. Later aircraft are equipped with additional structure around the doorway and bayonet latches in the door. The door is equipped with a spring to assist in closing and a hydraulic snubber to allow the door to open smoothly.

The door on later airplanes is equipped with door closers which are operated by gas springs. The latch mechanism should be kept clean. Lubricants that leave an oily or greasy coating should not be used because they tend to cause an accumulation of dirt and other contaminants. Refer to the Maintenance Manual for procedures for inspection, cleaning, installation, adjustment, and servicing.

CAUTION ENSURE THAT THE CLICK‐CLACK OR BAYONET LATCHES ARE COMPLETELY RETRACTED INTO THE DOOR BEFORE ATTEMPTING TO CLOSE THE DOOR. ATTEMPTING TO CLOSE THE DOOR WITH A LATCH EXTENDED CAN CAUSE SERIOUS DAMAGE TO THE LATCH. THIS DAMAGE, IN TURN, MAY MAKE IT IMPOSSIBLE TO EXTEND THE LATCHES PROPERLY INTO THE DOOR FRAME OR IT MAY CAUSE THE DOOR TO BE IMPOSSIBLE TO OPEN BY NORMAL PROCEDURE AFTER IT HAS BEEN CLOSED.

CLICK‐CLACK

Figure 6.52‐1

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM

AIRCRAFT SYSTEMS DOORS PASSENGER DOOR

SA227‐ SERIES/FCOM/VTM

6.52.2

Figure 6.52‐2

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM

AIRCRAFT SYSTEMS

DOORS SA227‐ SERIES/FCOM/VTM 6.52.3 EMERGENCY EXITS

Three emergency exits incorporating normal cabin windows are provided. Each exit provides a 20 by 28 inch (508 by 711 mm) opening. Two are located on the right side of the fuselage over the wing and one is located on the left side of the aircraft over the wing. The placards and handles are illuminated by fluorescent materials for operation in total darkness.

Figure 6.52‐3

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM

AIRCRAFT SYSTEMS

DOORS SA227‐ SERIES/FCOM/VTM 6.52.4 MAIN CARGO DOOR

The main cargo door is 53 in. high by 51.25 in. wide (134.62 cm. high by 130.18 cm. wide). It is hinged across the top and opens out and up. The door is furnished with two gas spring shock absorbers, for holding it in the open position.

A silicone seal is located around the outer frame of the door. The purpose of the seal is to aid in pressurizing the cabin. The solenoid door seal valve is triggered when the handle is moved to the locked position. The seal inflates with bleed air (18 psi [1.27 kg/cm2]) from the pneumatic system.

Eight receptacles are installed in the fuselage structure around the cargo door. Each receptacle provides a seating surface for the latch (Click-Clack) jaws, and forms the structural carry-hrough from the fuselage structure to the door. The six receptacles on the side of the door are equipped with steel bushings. These bushings may be rotated to aid in alignment of the door.

Figure 6.52-4

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM

AIRCRAFT SYSTEMS DOORS CARGO DOOR WARNING SYSTEM

SA227‐ SERIES/FCOM/VTM

6.52.5

SA227‐AT and AC aircraft have combination cargo door warning light and test circuit microswitches (two sets of contacts) installed in each door frame receptacle. One set of contacts provides a ground for the door warning light on the annunciator panel and a ground for the door warning light on the copilot’s instrument panel via the warning light relay. A test jack is provided on the right console to troubleshoot the switch normal circuit with an ohmmeter.

Figure 6.52-5 Cargo Door Warning System

NOSE BAGGAGE DOORS

The nose baggage compartment is located in the unpressurized nose section. A hinged door is installed on each side of the nose section to allow access to the avionics and baggage area. The doors are approximately 18 inches wide by 26 inches high (45.72 cm wide by 66.04 cm high). Both doors have a key operated lock to provide security for the baggage compartment.

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM

AIRCRAFT SYSTEMS

DOORS SA227‐ SERIES/FCOM/VTM 6.52.6 LANDING GEAR DOORS

MAIN GEAR

The main landing gear doors open to allow gear extension and close again when the gear is fully extended.

A thumb latch mechanism, riveted to the door at the aft hinge engages the door pickup stirrup. The latch permits bypassing the main gear door pickup mechanism to permit manual door operation for servicing and maintenance.

If any main landing gear is open before takeoff, a red warning light (GEAR DOOR POSITION) on the annunciator panel illuminates to warn the crew. The warning light remains illuminated on the ground until all main landing gear doors are secure.

NOSE GEAR

The nose gear doors are spring loaded overcenter to the open position when the gear is extended and are mechanically closed by linkage attached from the door to the landing gear door actuator hook when landing gear retracts.

Figure 6.52-6

Revision: Original Aug 1,2013

GO/FCOM/SA227‐SERIES/VTM