Learjet 60 - Abnormal Condition of Operation

Pilot's Manual
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Learjet 60
ABNORMAL
CONDITION OF OPERATION
Caution : This device
produces oxygen which
will vigorously acceler-
ate combustion
. Do not intentionally
expose the device to
direct flame
contact, or remove
in the immediate presence
of fire or
flame . Due to oxygen
saturation of the
hair, do not
smoke
or become exposed
to fire or flame immediately
after
removing .
Users should
be trained
to recognize
abnormal conditions
which
could
signify malfunction
or failure of
the equipment to
properly op-
erate .
Failure of the
starter candle :
If the starter
candle fails to
actuate when the
adjustment strap is
pulled, an
additional sharp
pull on the strap may
be sufficient to dis-
lodge the
lanyard pin and
actuate the device . If the
device still fails to
actuate,
the hood will continue
to function, although
the initial
purge
capability is
lost . Sticking the
fingers into the
neckseal to allow a
large
lung
inhalation may be
required to enable
sufficient breathing
vol-
ume until
the chemical
regeneration system begins
producing a sur-
plus
of oxygen .
Inadequate oronasal
mask seal :
Absence of a tight
seal of the oronasal cone
to the face may
result in
excess leakage of
the exhaled breath
into the hood, short circuiting
the
oxygen-generating canister .
This condition may result in
a build-up of
C02
within the rebreathing
volume in the hood . Excessive
C02 is nor-
mally indicated by breathing
distress such as rapid
and labored
breathing
accompanied by a
general feeling of insufficient
ability to
get one's
breath, although there
is no restriction to
breathing . Pres-
ence of moisture or fogging
on the visor and the sensation
of air es-
caping from the mask,
particularly around the nose and
eyes are indi-
cations of a lack of proper fit .
Adjustment of the mask
straps and
mask position
to minimize leakage
should rapidly alleviate the
prob-
lem . If the
perception of breathing distress
persists, the user should
quickly go to
a safe area and remove
the PBE and don alternate
breathing
equipment if required .
7- 1 4
PM-123
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