.
The crew heard the CB pop or observed a change in the associated aircraft system / warning light, which was previously normal but is now unpowered as a result of the CB being out.
.
There is a previous logbook entry about the same CB being tripped in the previous 3 days.
.
There is any associated electrical smoke / smell, or evidence of
overheating of any aircraft system. If any of the above conditions are noted, the crew should not reset the CB, but instead enter the findings in the logbook and call maintenance for investigation prior to departure.
After Block Out but Prior to Takeoff Any CB that is confirmed to have tripped, should not be reset by the crew. The crew can continue the flight with the CB left in the tripped mode, provided the affected system is not required as per the MEL, and all appropriate MEL procedures are complied with. Also there must be no electrical smoke/smell, or evidence of overheating of any aircraft system. In all cases a logbook entry is required.
After Takeoff but Prior to Block In One reset of a tripped circuit breaker may be attempted after a cooling period of approximately two minutes if called for by an emergency /abnormal checklist, or unless, in the judgement of the Captain, resetting the CB is necessary for the safe completion of the flight. If the circuit breaker trips again, do not attempt another reset. In all cases a logbook entry is required. All tripped circuit breakers regardless of phase of flight and whether reset or not, must be written up in the aircraft logbook. This entry should include:
1.
Name and location of the CB.
2.
Z -time when trip occurred (if known).
3.
Phase of flight, altitude/airspeed, etc, when trip occurred.
4.
Weather conditions if appropriate.
5.
Any pilot action that occurred prior or during the trip sequence.
6.
Attempted reset and results.
Emergency and abnormal checklists are designed, with the exception of Immediate Action items, as “Read and Do” checklists. All items of any emergency or abnormal checklist will be read aloud. The pilot designated by the Captain to accomplish the checklist (PM) shall first read and respond to Immediate Action items (if applicable) to ensure that such items have been accomplished completely and correctly. The PM shall then complete the Secondary Action items by reading each item, accomplishing the required task, and reading the response. The PM, while accomplishing the checklist, will coordinate with the PF before changing any switch or control position which could potentially affect systems integrity or aircraft configuration. Emergency and abnormal checklists may be combined with other normal or emergency / abnormal checklists to reduce or eliminate the need for crews to reference several different checklists in response to an abnormal situation. For example the ONE ENGINE INOPERATIVE APPROACH AND LANDING checklist includes the normal IN-RANGE, APPROACH, and LANDING checklists so that the aircraft may be safely landed in this situation with reference to only one checklist. Another example is the REJECTED TAKEOFF checklist which includes the EMERGENCY EVACUATION checklist procedures since an evacuation may possibly be required following a rejected takeoff and the crew would not need to reference an additional checklist.
When the performance of an additional checklist may be required following the completion of another checklist, a reference will be made at the bottom of the first checklist as a reminder to the crew. As each normal, abnormal, or emergency checklist is completed, the crewmember performing the checklist will announce "___________ CHECKLIST COMPLETE."
Quick Reference Handbook (QRH)
To facilitate more expeditious access to emergency and abnormal checklists, a Quick Reference Handbook (QRH) is carried in the cockpit. It contains a copy of all the emergency checklists and most of the abnormal checklists from the Aircraft Flight Manual. This would preclude having to take out the Flight Manual to reference a specific abnormal or emergency checklist.
The QRH is set up in a simple to use and easy to read format. The highlights of its construction are:
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All immediate action items are listed on the front cover.
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The first inside page has an alphabetical listing of all major sections aligned with the corresponding tab.
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All tabs are labeled with the name of the major systems for that section (because of the limited number of tabs, some of the sections are combined into logical system groups).
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