12.2
12.2
Condition: An inflight engine fuel leak is suspected or confirmed.
One or more of the following may be evidence of a fuel leak:
• visual observation of fuel spray from strut or engine
• excessive fuel flow
• total fuel quantity decreasing at an abnormal rate
• fuel imbalance
• USING RSV FUEL message
• INSUFFICIENT FUEL message
• CHECK FMC FUEL QUANTITY message.
CENTER TANK FUEL PUMP SWITCHES . . . . . . . . . . . . . .OFF
CROSSFEED SELECTOR . . . . . . . . . . . . . . . . . . . . . . CLOSED
Identify an engine fuel leak by observing one main fuel tank
quantity decreasing faster than the other.
An increase in fuel imbalance of approximately 230 kgs/500
lbs or more in 30 minutes should be considered an engine
fuel leak.
Conditions permitting, visually check for an engine fuel
leak.
Continued on next page
ENGINE FUEL LEAK
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.3
12.3
Continued from previous page
If both main tank quantities decrease at the same rate:
Resume normal fuel management procedures.
If FMC message USING RSV FUEL, INSUFFICIENT FUEL
or CHECK FMC FUEL QUANTITY is displayed on the CDU
scratchpad:
PROGRESS PAGE 1 . . . . . . . . . . . . . . . . . . . . . . SELECT
DESTINATION FUEL ESTIMATE . . . . . . . . . . . . . CHECK
Compare FMC fuel quantity with fuel gauges and
flight plan fuel.
If fuel quantity indicator is inoperative:
(U7.4 FMCs and earlier)
Accomplish the FUEL QUANTITY INDICATOR
INOPERATIVE checklist.
(U7.5 FMCs and later)
FMC FUEL WEIGHT (if required) . . . . . . . . ENTER
Enter and periodically update the manually
calculated fuel weight on the FMC PERF INIT
page.
Continued on next page
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.4
12.4
Continued from previous page
If an engine fuel leak is confirmed:
AUTOTHROTTLE . . . . . . . . . . . . . . . . . . . . . . . .DISENGAGE
THRUST LEVER (affected engine) . . . . . . . . . . . . . . CLOSE
ENGINE START LEVER (affected engine) . . . . . . . CUTOFF
APU. . . . . . . . . . . . . . . . . . . . . . . . . . . .START AND ON BUS
PACK SWITCH (affected side) . . . . . . . . . . . . . . . . . . . .OFF
[Causes operating pack to regulate to high flow with flaps up.]
TRANSPONDER MODE SELECTOR
(TCAS equipped airplanes) . . . . . . . . . . . . . . . TA/TA ONLY
After engine shutdown, all remaining fuel can be used for
the operating engine. Resume normal fuel management
procedures.
Plan to land at the nearest suitable airport.
Accomplish ONE ENGINE INOPERATIVE LANDING
checklist.
If MINIMUM FUEL OPERATION:
MAIN TANK FUEL PUMP SWITCHES. . . . . . . . . . . .ALL ON
CROSSFEED SELECTOR . . . . . . . . . . . . . . . . . . . . . . OPEN
Apply thrust changes slowly and smoothly. If a climb is
required, maintain the minimum pitch attitude required
for safe flight.
June 3, 2005
737 Flight Crew Operations Manual
Copyright © The Boeing Company. See title page for details.
12.5
12.5
Condition: A fuel FILTER BYPASS light illuminated indicates
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