737 Operations Manual
Checklist Introduction -
Non-Normal Checklists
Copyright © The Boeing Company. See title page for details.
CI.2.2 D6-27370-400E-TBCE
There are some situations which always require landing at the nearest suitable
airport. These situations include, but are not limited to, conditions where:
• the non-normal checklist contains the words “Plan to land at the nearest
suitable airport.”
• cabin smoke or fire which persists
• one main AC power source remaining (such as engine, or APU)
• one hydraulic system remaining (the standby system is considered a
hydraulic system), or
• any other situation determined by the crew to present a significant adverse
effect on safety if the flight is continued.
It should be stressed that for persistent smoke or a fire that cannot be positively
confirmed to be completely extinguished, the earliest possible descent, landing,
and passenger evacuation should be accomplished.
Checklists prescribing an engine shutdown must be evaluated by the captain to
ascertain whether an actual shutdown or operation at reduced thrust is the safest
course of action. Consideration must be given to probable effects if the engine is
left running at minimum required thrust.
Non-normal checklists also assume:
• After engine start and prior to takeoff, the appropriate non-normal
checklist is accomplished if a non-normal condition is identified. Upon
completion of the checklist, the Dispatch Deviation Guide or airline
equivalent is consulted to determine if Minimum Equipment List relief is
available.
• System controls are in the normal configuration for the phase of flight
prior to the initiation of the non-normal checklists.
• Aural alerts are silenced and the system reset by the flight crew as soon as
the cause of the alert is recognized.
• the EMERGENCY position of the oxygen regulator is used when
necessary to provide positive pressure in the masks and goggles to
evacuate contaminates. The 100% position of the oxygen regulator is used
when positive pressure is not required, but contamination of the flight
deck air exists. The NORMAL position of the oxygen regulator is used if
prolonged use is required and the situation permits. Normal boom mic
operation is restored when oxygen use is no longer required.
• Indicator lights should be tested to verify suspected faults.
June 07, 2002
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