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A B727-200 in climb at 16000 ft diverted due to the right pack tripping and unable to maintain cabin pressurization.
| Attributes | |
| ACN | 377211 |
| Time | |
| Date | 199708 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 16000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tower : bjc |
| Operator | common carrier : air carrier |
| Make Model Name | B727-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 3000 flight time type : 240 |
| ASRS Report | 377211 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
We had a right pack trip on takeoff. We were not able to regain control of the right air mix valve after completing the procedures for a pack trip. The cabin was climbing to 8000 ft when we decided to descend. We were able to hold a 7000 ft cabin at 11000 ft cruise altitude. After about 20 mins at 11000 ft the cabin started to climb again so we descended to 8000 ft and the cabin depressurized with the cargo heat outflow and the outflow valve closed. Note: the left pack was working properly the entire time and the maximum cabin altitude was 8500 ft. Our crew coordination was very good. We worked together very good. The first officer flew the plane while the captain and flight engineer ran the checklists. Callback conversation with reporter revealed the following information: reporter states the aircraft was a B727-200 and had no information from maintenance on the cause of the right pack tripping and the failure to pressurize the cabin. The reporter stated the left pack was operating normal but still could not maintain cabin pressure. The flight returned to the field.
Original NASA ASRS Text
Title: A B727-200 IN CLB AT 16000 FT DIVERTED DUE TO THE R PACK TRIPPING AND UNABLE TO MAINTAIN CABIN PRESSURIZATION.
Narrative: WE HAD A R PACK TRIP ON TKOF. WE WERE NOT ABLE TO REGAIN CTL OF THE R AIR MIX VALVE AFTER COMPLETING THE PROCS FOR A PACK TRIP. THE CABIN WAS CLBING TO 8000 FT WHEN WE DECIDED TO DSND. WE WERE ABLE TO HOLD A 7000 FT CABIN AT 11000 FT CRUISE ALT. AFTER ABOUT 20 MINS AT 11000 FT THE CABIN STARTED TO CLB AGAIN SO WE DSNDED TO 8000 FT AND THE CABIN DEPRESSURIZED WITH THE CARGO HEAT OUTFLOW AND THE OUTFLOW VALVE CLOSED. NOTE: THE L PACK WAS WORKING PROPERLY THE ENTIRE TIME AND THE MAX CABIN ALT WAS 8500 FT. OUR CREW COORD WAS VERY GOOD. WE WORKED TOGETHER VERY GOOD. THE FO FLEW THE PLANE WHILE THE CAPT AND FE RAN THE CHKLISTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE ACFT WAS A B727-200 AND HAD NO INFO FROM MAINT ON THE CAUSE OF THE R PACK TRIPPING AND THE FAILURE TO PRESSURIZE THE CABIN. THE RPTR STATED THE L PACK WAS OPERATING NORMAL BUT STILL COULD NOT MAINTAIN CABIN PRESSURE. THE FLT RETURNED TO THE FIELD.
Data retrieved from NASA's ASRS site as of July 2007 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.