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A DC9-40 has one air conditioning pack as a deferred item. On takeoff the other pack fails. The captain elects to make an overweight landing at departure airport, acy.
| Attributes | |
| ACN | 415615 |
| Time | |
| Date | 199810 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : acy |
| State Reference | NJ |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 40 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing other other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 140 flight time total : 8800 flight time type : 2000 |
| ASRS Report | 415615 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7200 flight time type : 130 |
| ASRS Report | 415821 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
We departed acy with the left air conditioning pack deferred and the right air conditioning pack the sole system for pressurizing the aircraft. Soon after takeoff the right pack began to fail. We referenced company checklists and could not restore the system. We advised ATC that we needed to return to acy. I then contacted dispatch and advised them of our situation and that we were at that time 8000 pounds over landing weight. I asked if we could land overweight or should we burn off fuel. I was advised by company dispatch that a landing at 107000 pounds, (6000 pounds) over landing weight would be acceptable. We then advised acy ATC of our intention to land overweight and that we are declaring an emergency for the overweight landing in order to have crash fire rescue equipment available as a precaution for this non standard procedure and to add a higher level of safety. When all checklists were accomplished and we were down to our target weight I landed the aircraft with no further incidents.
Original NASA ASRS Text
Title: A DC9-40 HAS ONE AIR CONDITIONING PACK AS A DEFERRED ITEM. ON TKOF THE OTHER PACK FAILS. THE CAPT ELECTS TO MAKE AN OVERWEIGHT LNDG AT DEP ARPT, ACY.
Narrative: WE DEPARTED ACY WITH THE L AIR CONDITIONING PACK DEFERRED AND THE R AIR CONDITIONING PACK THE SOLE SYS FOR PRESSURIZING THE ACFT. SOON AFTER TKOF THE R PACK BEGAN TO FAIL. WE REFED COMPANY CHKLISTS AND COULD NOT RESTORE THE SYS. WE ADVISED ATC THAT WE NEEDED TO RETURN TO ACY. I THEN CONTACTED DISPATCH AND ADVISED THEM OF OUR SIT AND THAT WE WERE AT THAT TIME 8000 LBS OVER LNDG WT. I ASKED IF WE COULD LAND OVERWT OR SHOULD WE BURN OFF FUEL. I WAS ADVISED BY COMPANY DISPATCH THAT A LNDG AT 107000 LBS, (6000 LBS) OVER LNDG WT WOULD BE ACCEPTABLE. WE THEN ADVISED ACY ATC OF OUR INTENTION TO LAND OVERWT AND THAT WE ARE DECLARING AN EMER FOR THE OVERWT LNDG IN ORDER TO HAVE CFR AVAILABLE AS A PRECAUTION FOR THIS NON STANDARD PROC AND TO ADD A HIGHER LEVEL OF SAFETY. WHEN ALL CHKLISTS WERE ACCOMPLISHED AND WE WERE DOWN TO OUR TARGET WT I LANDED THE ACFT WITH NO FURTHER INCIDENTS.
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.