<< >> NASA ASRS Report 1417917, January 2017

Tbm-900 pilot reported changing the bleed air switch from auto to max diff. This caused a depressurization and the pilot had to immediately descend to 8;000 ft.

Attributes
ACN	1417917
Time
Date	201701
Local Time Of Day	1201-1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	TBM 700/TBM 850
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Private
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 1200 Flight Crew Type 130
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

While leveling off at final altitude; I switched the bleed switch from auto bleed to max diff. The cabin then depressurized. I descended the aircraft to a breathable altitude and resumed flight at 6;000 ft.

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Original NASA ASRS Text

Title: TBM-900 pilot reported changing the bleed air switch from auto to Max Diff. This caused a depressurization and the pilot had to immediately descend to 8;000 ft.

Narrative: While leveling off at final altitude; I switched the bleed switch from Auto Bleed to Max Diff. The cabin then depressurized. I descended the aircraft to a breathable altitude and resumed flight at 6;000 ft.

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.