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B737 is improperly dispatched at normal cruise altitudes; but should have been planned for unpressurized flight. Flight diverted when aircraft became unpressurized.
| Attributes | |
| ACN | 742639 |
| Time | |
| Date | 200706 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial ground : takeoff roll |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel |
| Qualification | other |
| ASRS Report | 742639 |
| Events | |
| Anomaly | non adherence : company policies |
| Independent Detector | other other : 1 |
| Resolutory Action | flight crew : diverted to another airport flight crew : landed as precaution none taken : detected after the fact |
| Supplementary | |
| Problem Areas | Aircraft Company Maintenance Human Performance |
| Primary Problem | Company |
Narrative:
The flight was planned on a normal profile; but should have been planned unpressurized below 10000 ft. Maintenance control from B737 desk at maintenance control advised that flight abc should have been planned unpressurized. I immediately sent an ACARS message to the flight. While I was typing the flight advised that they had lost pressurization and were diverting to ZZZZ1. I received an ACARS message from the crew. The flight descended to below 10000 ft and diverted to ZZZZ1. Ferry flight advisory as well as ferry permit should include information on known restrs such as unpressurized flight required. Callback conversation with reporter revealed the following information: reporter stated that this was a maintenance ferry; and was initially planned and filed at normal altitudes. After the flight had departed; information was received from maintenance that the flight should be flown unpressurized below 10000 ft.
Original NASA ASRS Text
Title: B737 IS IMPROPERLY DISPATCHED AT NORMAL CRUISE ALTS; BUT SHOULD HAVE BEEN PLANNED FOR UNPRESSURIZED FLT. FLT DIVERTED WHEN ACFT BECAME UNPRESSURIZED.
Narrative: THE FLT WAS PLANNED ON A NORMAL PROFILE; BUT SHOULD HAVE BEEN PLANNED UNPRESSURIZED BELOW 10000 FT. MAINT CTL FROM B737 DESK AT MAINT CTL ADVISED THAT FLT ABC SHOULD HAVE BEEN PLANNED UNPRESSURIZED. I IMMEDIATELY SENT AN ACARS MESSAGE TO THE FLT. WHILE I WAS TYPING THE FLT ADVISED THAT THEY HAD LOST PRESSURIZATION AND WERE DIVERTING TO ZZZZ1. I RECEIVED AN ACARS MESSAGE FROM THE CREW. THE FLT DSNDED TO BELOW 10000 FT AND DIVERTED TO ZZZZ1. FERRY FLT ADVISORY AS WELL AS FERRY PERMIT SHOULD INCLUDE INFO ON KNOWN RESTRS SUCH AS UNPRESSURIZED FLT REQUIRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THAT THIS WAS A MAINT FERRY; AND WAS INITIALLY PLANNED AND FILED AT NORMAL ALTS. AFTER THE FLT HAD DEPARTED; INFO WAS RECEIVED FROM MAINT THAT THE FLT SHOULD BE FLOWN UNPRESSURIZED BELOW 10000 FT.
Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.