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loss of cabin pressurization. Verify that cabin pressure is uncontrollable and
attempt to determine if there is structural damage. If structural damage is
confirmed or suspected, limit airspeed in the descent to current speed or less. If
conditions permit, the cabin crew will be advised, on the PA system, of
impending rapid descent.
All immediate action items are to be accomplished by memory. Either pilot will
call out any items not completed. Perform the entry procedure deliberately and
methodically. Do not be distracted from flying the aircraft.
Emergency descent will be made with the landing gear up. The autopilot may
be used if desired.
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.
AIR SYSTEMS
Sec. 2.2 Page 14
Rev. 11/15/02 #41
Continental
737
Flight Manual
Manual Flight
To manually fly the maneuver, disconnect the autothrottles and retard thrust
levers to idle. Extend speed brakes, disconnect the autopilot, and smoothly
adjust the pitch attitude, (approximately 10 degrees nose down). About 10
knots before reaching target speed (VMO/MMO), smoothly adjust the pitch
attitude to maintain target speed. Keep the aircraft in trim at all times. If
VMO/MMO is inadvertently exceeded, change pitch smoothly to decrease speed.
Approaching level off altitude, smoothly adjust pitch attitude to reduce rate of
descent. The speed brake lever should be returned to the down detent when
approaching the desired level off altitude. After reaching level flight, add thrust
to maintain long range cruise or other desired speed.
Use Of The Autopilot
The autopilot may be left engaged and used to accomplish the descent. If the
autopilot is used for descent, HDG SEL may be used if desired to effect a turn
during the entry. A turn is not required, but is optional.
Combinations of the pitch modes may be used.
Level Change
LVL CHG mode may be used for the entire procedure; however, entry rates are
slower. As in the V/S mode entry, the altitude selector must be set to the lower
altitude, and then LVL CHG can be engaged. Next, set the command speed bug to
VMO/MMO and extend speed brakes. The AFCS will smoothly pitch the aircraft
down to capture the target speed while the thrust levers retard to idle for
maximum descent rate. Ensure proper altitude is set in the altitude window.
When approaching the altitude set in the altitude select window, ALT ACQ will
engage automatically. The pitch mode will then control altitude and the thrust
levers will increase to hold speed which should be set as desired on the
command speed bug. Smoothly return the speed brakes lever to the down
detent during the level off maneuver.
737
Flight Manual
Continental
AIR SYSTEMS
Sec. 2.2 Page 15
Rev. 11/15/02 #41
Vertical Speed Mode
V/S can be used by selecting an altitude lower than current altitude and
selecting maximum rate of descent on the V/S wheel (-7900). Raise the speed
brakes and ensure thrust levers retard to idle. Airspeed will increase above
cursor speed during the descent. Select LVL CHG prior to increasing cursor speed
to preclude autothrottle movement. After LVL CHG is engaged, the airspeed
cursor may be increased to VMO/MMO or slightly less. If the autothrottles were
disconnected, they may be rearmed at this time.
Check that the altitude selector is properly set for the planned level off altitude.
The ALT ACQ mode should automatically engage and command a smooth level off
if the altitude select window has been present during the descent. During the
level off maneuver, set the target speed bug as desired and smoothly return the
speed brake lever to the down detent.
Control Wheel Steering
CWS may be used to reduce pilot workload and allow the Captain to divert
more of his attention away from basic aircraft control. Follow the manually
flown procedure but instead of disengaging the autopilot, engage CWS by
pushing forward on the yoke.
During Descent
The Pilot Monitoring will check minimum enroute altitude, notify ATC, obtain
altimeter setting, and call out altitudes approaching level off. If not in contact
with ATC, squawk 7700. Level off at 10,000 feet cabin altitude or minimum
　
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