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Cruise at Long Range Cruise
Descent at .78/280
Sec. 5 Page 74 737
Rev. 11/15/02 #41 Continental Flight Manual
INTENTIONALLY LEFT BLANK
737 Sec. 5 Page 75
Flight Manual Continental Rev. 11/15/02 #41
NON-NORMAL
Inflight Diversion
In the event a flight must be diverted while enroute (both engines remain
operating) and performance information is not readily available from Dispatch
and/or Load Planning, it is recommended that the flight crew refer to the TWO
ENGINE LONG RANGE CRUISE CHART (located in this section) for planning
purposes.
WARNING: FMC Calculated fuel predictions are based on gear and flaps up
during climb, cruise and descent. Any prolonged flight with
gear and/or flaps extended will increase fuel required and will
not be displayed correctly on the FMC fuel prediction pages.
Dirftdown / Terrain Clearance Weight Restrictions
When a flight is planned over high terrain, the Dispatch Release considers
single engine operation at the most critical segments of the flight. The MAX
GTOW could be restricted by Terrain Clearance (TC) or Driftdown (DD)
performance criteria. This restriction is pre-faced with “Subject to the
following conditions…PLAN 3… (TC or DD)…”. The dispatch Driftdown
and Terrain Clearance weights are based on net aircraft performance using the
APU as the bleed source for pressurization below 17,000 ft. Therefore, if APU
bleed air is placarded inoperative, an additional dispatch weight penalty may be
incurred due to the engine bleed required for pressurization. All of the
following One Engine Inoperative performance charts are based upon gross
aircraft performance using bleed air from the operating engine for pressurization
and may differ slightly from dispatch calculations.
In the event of an engine failure during cruise, it will generally be necessary to
reduce speed and descend to a lower altitude. Immediately following engine
failure, set Max Continuous Thrust Limit %N1 and allow the aircraft to descend
at the optimum driftdown speed shown in the single engine cruise page of the
FMC or the driftdown table. The aircraft should level off at the altitude and
weight shown. If terrain clearance is critical, maintain the level off altitude and
allow the aircraft to accelerate to the Long Range Cruise speed shown. If terrain
clearance is not critical, the aircraft may be accelerated immediately to Long
Range Cruise speed with a resulting loss in altitude of up to 3,000 feet. When
the Long Range Cruise speed is achieved, follow a level flight cruise procedure
at the airspeed appropriate to the aircraft weight.
Sec. 5 Page 76 737
Rev. 11/15/02 #41 Continental Flight Manual
Terrain Clearance
A Terrain Clearance limited MAX GTOW considers loss of an engine at cruise,
descent at an optimum speed or rate to a lower level-off altitude, that if
maintained, would guarantee a minimum 1,000 ft. terrain clearance above the
highest feature over the entire length of the planned flight route.
Driftdown
A Driftdown limited MAX GTOW allows a greater takeoff weight than the
Terrain Clearance weight, but in the event of engine loss, the flight must land at
an alternate airport. (The 1000’ terrain clearance guarantee is lost with the
higher takeoff weights.) These airports are designated as Driftdown Alternates
on the flight plan, and as such must meet all alternate airport criteria. The
standard mountain clearance of 2000 ft. is maintained with the Driftdown
profiles.
737 Sec. 5 Page 77
Flight Manual Continental Rev. 11/15/02 #41
>>@ Initial Max Continuous %N1- One Engine Inop
PRESS
ALT
TAT °C - .74M A/C AUTO (HIGH)
FEET -50 -40 -30 -25 -20 -15 -10 -5 0 5 10 15 20
37000 90.0 92.0 94.0 94.9 95.4 94.9 94.6 94.4 94.1 93.8 93.5 93.1 92.7
35000 89.5 91.5 93.4 94.4 95.3 95.0 94.7 94.5 94.2 93.9 93.6 93.2 92.8
33000 88.3 90.3 92.2 93.2 94.1 95.0 94.7 94.5 94.2 93.9 93.6 93.2 92.8
31000 87.3 89.2 91.1 92.0 93.0 93.9 94.7 94.5 94.2 93.9 93.6 93.2 92.8
29000 86.4 88.3 90.2 91.1 92.0 93.0 93.9 94.6 94.3 94.0 93.7 93.3 92.9
27000 85.5 87.4 89.2 90.1 91.0 91.9 92.8 93.7 94.3 94.0 93.7 93.3 92.9
>>@ Driftdown Speed / Level Off - One Engine Inop
WEIGHT
1000 LBS LEVEL OFF ALTITUDE - FT
START
DRIFT
DOWN
LEVEL
OFF
OPTIMUM
DRIFT DOWN
SPEED
ISA + 10°C
&
BELOW
ISA +
15°C
ISA +
20°C
140 135 235 17000 16000 14600
130 124 227 18600 17900 17000
120 115 218 20600 19600 18300
110 106 209 23300 22200 21000
100 96 199 26200 25200 24100
90 87 190 29200 28300 27300
　
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