Scenario: Airline Boeing 757 (ACARS equipped).
San Diego, CA -to- Dallas/Ft. Worth, TX. Operated IFR under FAR Part 121.
What information is available prior to departure? Similar to the DC-9 story above, the AOC develops the route to be flow, taking into account payload, MEL, and fuel considerations and files the flight plan with ATC. Unlike the DC-9, the B757 can have the flight plan data linked directly into the FMS, using ACARS, which is a time-saver and reduces the potential for a keystroke error on the part of the flight crew.
How does the pilot learn of the developing situation?
Same as the DC-9 scenario.
How does replanning occur?
AOC replans, as before, but there is the capability to uplink informational messages via ACARS as well as the proposed flight plan amendment.
Conclusions and Commentary
Same as DC-9 scenario.

Scenario: Package Carrier Boeing 757 (ACARS equipped).
San Diego, CA -to- Dallas/Ft. Worth, TX. Operated IFR under FAR Part 121.
Change to Baseline Scenario. The basic scenario needs for a weather related event is fundamentally the same between an airline and a package carrier when both are operating under FAR Part 121. What makes for an interesting scenario is the difference in fleet operations with regards to a specific aircraft becoming unavailable, and the resulting actions taken to accommodate the load.
In the short scenario to be described, rather than a weather event, the package carrier aircraft will suffer a mechanical malfunction which requires it to land in Albuquerque, NM.
What information is available prior to departure? Similar to the airline story, the package carrier has a dispatch department that provides them information on payload, fuel, route of flight, and files the flight plan with the departure ARTCC approximately 2 hours in advance of the departure.
How does the pilot learn of the developing situation?
In this scenario, the aircraft has a clogged oil filter develop in the left engine. The Engine Indication and Crew Alerting System (EICAS) cautions the pilot of an oil OVERTEMP in the left engine, which requires the flight crew to shut the engine down and divert to a nearby airport.
As the crew completes the ENGINE SHUTDOWN CHECKLIST and performs the nominal tasks associated with notifying ATC of their problem and a request to land at ABQ, they inform their dispatcher that the aircraft is being diverted.
How does replanning occur?
It is the case that package carriers operate “sweep” aircraft for just such a situation. The sweep aircraft has been launched from an east coast city and takes up a holding pattern in a portion of sparsely used airspace awaiting word from dispatch of any problems with any of the east coast traffic headed towards the company’s main distribution center. When the east coast flights all report that they can make the airfield where the main distribution center is located, the sweep aircraft begins to fly west to be closer to any aircraft flying in from the west that might experience a malfunction.
　
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