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An Operations Manual for an aircraft should be clear, concise and unambiguous. All too often, subsequent Chief Pilots or Fleet Managers add their vision to a manual or checklist, without proper consultancy of Aircraft Flight Manuals or crosschecking if their vision is not contradicted on another page. This is only natural, but when a pilot is confronted with an Operations Manual that has multiple ways of doing the same 'procedure', each will find his own way and standardization is lost.
When an airline builds its own Operations Manual, it is quite common to lose sight of the end-user of the product. The result is a collection of unintegrated manuals and procedures as shown in the following examples:
The Normal Checklist contradicts the Emergency Procedure (Dash 8 specific)
During certain Hydraulic Failures, the Normal checklist calls for the Standby Pump Units (SPU) ON, while one should remain OFF. Habit and stress may easily lead to switching ON a pump that should be OFF.
Especially in emergency conditions it is observed that crews have 3 or even 4 different information sources (manuals) open on the glareshield - confusing and an invitation for error. Calculating Landing Distance is a good example of an interuption of a procedure: it is either forgotten, done roughly from memory or the cause of not finishing the proper emergency procedure.