When should flight crews refer to MEL/CDL versus QRH for an inoperative system?

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Multiple Choice

When should flight crews refer to MEL/CDL versus QRH for an inoperative system?

When a system is inoperative, you start with the MEL/CDL to see if the fault is allowed to be left inoperative and what limitations apply. The MEL and CDL specify which equipment can be unavailable yet the aircraft remains airworthy and what operating restrictions or procedures must be followed to continue the flight. If the fault is within those defined limits, you follow the MEL/CDL guidance. If the fault isn’t addressed by the MEL/CDL or it requires abnormal procedures beyond what those documents cover, you turn to the QRH. The QRH provides the specific crew actions for abnormalities, including steps to manage the situation in flight or decide on diversion/return, when the MEL/CDL does not apply or is insufficient.

When a system is inoperative, you start with the MEL/CDL to see if the fault is allowed to be left inoperative and what limitations apply. The MEL and CDL specify which equipment can be unavailable yet the aircraft remains airworthy and what operating restrictions or procedures must be followed to continue the flight. If the fault is within those defined limits, you follow the MEL/CDL guidance.

If the fault isn’t addressed by the MEL/CDL or it requires abnormal procedures beyond what those documents cover, you turn to the QRH. The QRH provides the specific crew actions for abnormalities, including steps to manage the situation in flight or decide on diversion/return, when the MEL/CDL does not apply or is insufficient.

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