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Note: When using a boom microphone, it may be necessary to use the
flight deck speaker and properly set audio panel switches to
establish crew communications. Press crew interphone receiver
down and set volume arrow at 12 o’clock or greater. Set
MASK/BOOM selector to MASK. Use I/C toggle on audio selector
panel or bottom position on YOKE ROCKER switch when speaking to
other pilot.
Note: The PM should accomplish or verify that the secondary action
items are completed. The PM does not need to challenge an item
aloud unless it is not accomplished or cannot be visually verified
that the item is completed. This is done to reduce the adverse
effects of communications with oxygen masks on.
IF Cabin Altitude Is Above 10,000 Feet But Below 14,000 Feet:
L & R Engine Bleed Air Switches................................................ON
L & R Pack Switches................................................................HIGH
Pressurization Mode Selector............................... MAN DC / MAN
Outflow Valve Switch............................................................ CLOSE
Note: If pressurization is restored, continue manual operation. If
cabin altitude is controllable, evaluate alternative options for
continuation of the flight to destination, diversion, or alternate
airport. ~
(Continued)
OR
AIR SYSTEMS
Sec. 2.2 Page 8
Rev. 11/15/02 #41
Continental
737
Flight Manual
Operate outflow valve to maintain proper cabin altitude and cabin rate
of change.
Note: If cabin altitude cannot be controlled, refer to cabin altitude
AT OR ABOVE 14,000 FEET procedure below.
* * * *
IF Cabin Altitude Is At Or Above 14,000 Feet:
Determine Structural Integrity.
Note: It may be difficult, or impossible, to accurately determine the
structural condition of the aircraft. If structural integrity is
unknown or confirmed to be compromised (i.e. cargo door
light, explosion, cabin door/window failure), serious
consideration should be given to an emergency descent
profile which would not increase the stress on the aircraft.
Such a descent would be at or below the existing airspeed.
Use of speed brakes would be at the discretion of the Captain.
Use of LVL CHG would allow control of A/S during descent.
Engage MACH/SPEED CHANGEOVER button to SPEED.
Note: High speed descent profile assumes structural integrity and
smooth air. Do not assume structural integrity unless it can
be positively assured from the flight deck. The cabin crew
will be advised on the PA system of impending rapid descent.
BC Per Airworthiness Directives 2001-12-51 and 2002-08-52, “Do not
operate the airplane at speeds in excess of 300 KIAS with speedbrakes
extended.
WARNING: Use of speedbrakes at speeds in excess of 320 KIAS
could result in a severe vibration which, in turn,
could cause extreme damage to the horizontal
stabilizer.”
Note: Under the Captains Emergency Authority and after careful
consideration, speedbrake deployment above 300 KIAS may
be accomplished for emergency descent.
ATC........................................................................................ADVISE
The PM will advise ATC of the emergency and the beginning of
the emergency descent. Due to the nature of this emergency, it is
not necessary to delay the execution of the descent until receiving
a clearance from ATC. However, it is imperative that ATC be
able to direct other aircraft away from the airspace needed for this
emergency.
(Continued)
~
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 9
Rev. 11/15/02 #41
Emergency Descent .................................................ACCOMPLISH
With the cabin altitude above 14,000 feet, initiate an emergency
descent.
Normally, the descent is initiated straight ahead. If the Autopilot is
engaged, descent may be initiated by selecting a lower altitude in the
altitude select window of the MCP, and engaging LVL CHG. Ensure that
the Autothrottle retards the throttles. If not, disengage and manually
retard to idle. The target speed, if structural integrity can be
confirmed, will be VMO/MMO.
Start Switches.................................................................................. FLT
Provides ignition from both sets of igniters for maximum
protection in the event of icing, severe precipitation, or
turbulence.
Throttles ..................................................................................CLOSED
Speed brake............................................................. FLIGHT DETENT
Target Speed (High Speed Profile)........................................VMO/MMO
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