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B737-300 ETOPS

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PostPosted: Thu Feb 07, 2008 5:44 am    Post subject: B737-300 ETOPS Reply with quote

Extended Range Operation with Two Engine Airplanes (ETOPS) are those flights which include points at a flying distance greater than one hour (in still air) single engine cruise speed from an adequate airport.

Normal procedures on ETOPS flight do not differ from standard normal procedures. However, during the last hour of ETOPS cruise, the FAA currently require that a fuel crossfeed valve check be performed on airplanes with a single crossfeed valve. This verifies that the crossfeed valve is operating so that on the subsequent flight, if an engine fails, fuel feed is available from both main tanks through the crossfeed valve.

Before entering the ETOPS phase of flight, the APU must be operating.

ETOPS engine out procedures may be different from standard non-normal procedures. Following an engine failure the crew performs a modified “driftdown” procedure determined by the ETOPS route requirements. This procedure typically uses higher descent and cruise speeds and a lower cruise altitude following an engine failure. This allows the airplane to reach an alternate airport within the specific time limits authorized for the operator. These cruise speeds and altitude are determined by the airline and approved by its regulatory agency and usually differ from the engine out speeds provided by the FMC. The captain, however, has the discretion to modify this speed if actual conditions following the diversion decision dictate such a change.
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