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Md-80 captain reported both air conditioning packs failed inflight at FL230; perhaps due to icing of the inlet doors. Packs resumed normal operation after exiting icing conditions.
| Attributes | |
| ACN | 1405347 |
| Time | |
| Date | 201611 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning and Pressurization Pack |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Weather / Turbulence |
Narrative:
Depressurization due to both packs failing. While at FL230 the pressurization flow light illuminated. We noticed the right pack flow indicated zero. About 30 seconds later the left pack flow indicated zero and the cabin began to climb. We request 10;000 feet. We were immediately given 10;000 ft and expedited a descent. Since the cabin altitude started about 4;000 ft before it began to climb and at no point approached anything close to a cabin altitude of 10;000 ft; we never declared an emergency.we were in icing conditions at FL230 and while in the descent. The engine and wing anti-ice was on before the pressurization problem and during the descent. Passing through about 16;000 ft one pack came back and about 30 seconds later the other pack came back. We leveled off at 16;000 ft for the remainder of the flight. Fuel was not an issue.I suspect the air conditioning ram air scoop inlet duct iced up. I wrote the issue in the aml along with what I suspected the issue was. Prior to the pack failing; the cabin and cockpit temperature selections were normal.
Original NASA ASRS Text
Title: MD-80 Captain reported both air conditioning packs failed inflight at FL230; perhaps due to icing of the inlet doors. Packs resumed normal operation after exiting icing conditions.
Narrative: Depressurization due to both packs failing. While at FL230 the pressurization flow light illuminated. We noticed the right pack flow indicated zero. About 30 seconds later the left pack flow indicated zero and the cabin began to climb. We request 10;000 feet. We were immediately given 10;000 ft and expedited a descent. Since the cabin altitude started about 4;000 ft before it began to climb and at no point approached anything close to a cabin altitude of 10;000 ft; we never declared an emergency.We were in icing conditions at FL230 and while in the descent. The engine and wing anti-ice was on before the pressurization problem and during the descent. Passing through about 16;000 ft one pack came back and about 30 seconds later the other pack came back. We leveled off at 16;000 ft for the remainder of the flight. Fuel was not an issue.I suspect the Air Conditioning Ram Air Scoop Inlet Duct iced up. I wrote the issue in the AML along with what I suspected the issue was. Prior to the pack failing; the cabin and cockpit temperature selections were normal.
Data retrieved from NASA's ASRS site 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.