Learjet 60 - Light

Leaijet 60

Mars Manual
CABIN ENTRY DOOR
The cabin door consists of an upper portion that forms a canopy when
open anda
lower
portion with integral steps . On some aircraft the upper
portion has a torsion
bar to
provide
opening assistance . On other aircraft
the
upper portion
has gas-charged struts (gas springs) installed to assist
in door opening . A latch, when over centered, retains the door in the
position . A door release handle, located on the aft door frame,
echanically releases the
latch
to allow the
upper
door
to close . On
aircraft
a damper
is
attached to the torsion bar linkage to soften
door opening and
closing
movements . On other aircraft the gas-charged
struts provide a dampening effect to soften door opening and closing
movement .
The lower
portion
of the door incorporates a torsion bar
tern to provide closing assistance
.
Cables attached
to take-up
reels
installed on the forward and aft lower door structure to aid in
closing
and prevent damage if the door is inadvertently allowed to
drop
open . A self-contained
hydraulic
damper
is
also attached
to the
lower
door as an additional protection against
dropping
the door . Each door
half has a locking handle which, when rotated, drives a series of locking
pins
into
am fuselage structure and through interlocking arms secure
the halves
together . When the pins
are engaged, the door becomes
a
rigid structural member . Mere is a secondary safety latch installation on
the lower door separate from the door locking system . This installation
will hold the lower door against the door frame seal,
and
align the
locking pins with the pin holes
. When the lower door
is unlocked, the
safety
latch
will keep the door from falling open . This latch may be
operated from either inside or outside the aircraft . A key lock is
provided on the upper door to secure the aircraft from the outside .
Rotating the key lock will move a locking bar over the inside upper door
handle, preventing it from rotating to the open position .
ENTRY
DOOR
LIGHT
At red HMO( WKS warning light
is
installed on the glareshield
an-
nunciator panel to provide the crew with visual indication of cabin door
security
.
The light will illuminate and flash to indicate that one or more
of the
locking pins
is
not fully engaged or that the key
lock is in
the
locked position . Me
light
011 illuminate steady when the entry door is
hall open and power is on the aircraft . If
all
pins are fully engaged, and
the locking bar is recessed, the most probable cause for illumination is a
switch malfunction or misalignment .