PARKING BRAKE on the pilot's subpanel (fig. 2-8).
Pulling the handle full out sets the check valves in the
system and any pressure being applied by the toe
brakes is maintained. The parking brake is released
when the brake handle is pushed in. The parking brake
may be set from either the pilot's or copilot's position.
The parking brake shall not be set during flight.
2-9. ENTRANCE AND EXIT PROVISIONS.
Two keys are provided in the loose
tools and equipment bag. Both keys
fit the locks on the cabin door,
emergency hatch, tailcone access
door, and the right and left nose
avionics compartment doors.
a. Cabin Door.
Structural damage may occur if more
than one person is present on the
airstair cabin door at one time. The
door is weight limited to 300 pounds.
An airstair cabin door (fig. 2-11), hinged at the
bottom, provides a stairway for normal and emergency
entrance and exit. In the closed position, the door
becomes an integral part of the cargo door. The cabin
door is provided with steps, two of which fold flat against
the door in the closed position. A step folds down over
the door sill when the door opens to provide a platform
(step) for door seal protection. A plastic-encased cable
provides a handhold and support for the door in the open
position and a convenience for closing the door from
inside. A hydraulic damper permits the door to lower
gradually during opening. A rubber seal around the door
seals the pressure vessel while the aircraft is in flight.
The door locking mechanism is operated by either of the
two mechanically interconnected handles, one inside
and the other outside the door. When either handle is
rotated, three rotating cam-type latches on either side of
the door capture posts mounted on the cargo door. A
button adjacent to the door handle must be depressed
before the handle can be rotated to open the door. A
bellows behind the button is inflated when the aircraft is
pressurized to prevent accidental unlatching and/or
opening of the door. A placard adjacent to the window
instructs the operator that the safety lock arm is in
position around the bellows shaft which indicates a
properly locked door. Pushing the red button adjacent to
the window will illuminate the inside door mechanism. A
CABIN DOOR annunciator on the caution/l advisory
panel will illuminate if the door is not closed and all
latches fully locked. The cabin door opening is 21.5
inches wide by 50.0 inches high.
b. Cargo Door. A swing-up cargo door
(fig. 2-11), hinged at the top, provides access for loading
cargo or bulky items. The cargo door opening is 52.0
inches wide by 52.0 inches high. After initial opening
force is applied gas springs will completely open the
cargo door automatically. The door is counterbalanced
and will remain in the open position. A door support rod
is used to hold the door in the open position, and to aid
in overcoming the pressure of the gas spring assemblies
when closing the door. Once closed, the gas springs
apply a closing force to assist in latching the door. A
rubber seal around the door seals the pressure vessel
while in flight. The door locking mechanism is operated
only from inside the aircraft, and is operated by two
handles, one in the bottom forward portion of the door
and the other in the upper aft portion of the door. When
the upper aft handle is operated per placard instructions,
cam-type latches (two on the forward side of the door
and two on the aft side) rotate, capturing posts mounted
on the fuselage side of the door opening. The bottom
handle, when operated per placard instructions, actuates
four pin-lug latches across the bottom of the door. A
button on the upper aft handle must be pressed before
the handle can be released to open or latch the door. A
latching lever on the bottom handle must be lifted to
release the handle before the lower latches can be
opened. These act as additional aids in preventing
accidental opening or unlatching of the door. The cabin
and cargo doors are equipped with dual sensing circuits
to provide the crew with remote indication of cabin/cargo
door security. An annunciator, placarded CABIN
DOOR, will illuminate if the cabin or cargo door is open
and the BATTERY switch is on. If the BATTERY switch
is off, the annunciator will illuminate only if the cabin
door is not securely closed and latched. The
cabin/cargo door sensing circuit receives power from the
hot battery bus.
When operating the cargo door,
ensure that the cabin door is closed
and locked. Operating the cargo
door while the cabin door is open
may damage the door hinge and
(1) Opening the cargo door.
mechanism, avoid side loading of the
Handle access door (lower forward
corner of door) - Unfasten and open.
Handle - Lift hook and move to