<< >> NASA ASRS Report 1231826, January 2015

A B737-700 flight crew declared an emergency and initiated an emergency descent when both engine bleeds tripped off. During the descent they conducted the associated QRH procedure and the bleeds resumed operation. Passenger O2 masks were not deployed.

Attributes
ACN	1231826
Time
Date	201501
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Pneumatic Valve/Bleed Valve
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 165
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

While descending on the arrival we had both engine bleeds trip off while passing through FL390. We received the cabin altitude warning and did the emergency action items and QRH. We asked for an emergency descent to 10;000 ft. We were able to keep the cabin altitude around approximately 10;000 ft. The passenger oxygen masks did not deploy. Using the QRH we were able to reset both of the engine bleeds and the cabin altitude returned to normal. I was informed that most of the passengers were not aware of the situation until I informed them during the descent. I am not aware of any passenger issues as a result of this event.

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Original NASA ASRS Text

Title: A B737-700 flight crew declared an emergency and initiated an emergency descent when both engine bleeds tripped off. During the descent they conducted the associated QRH procedure and the bleeds resumed operation. Passenger O2 masks were not deployed.

Narrative: While descending on the arrival we had both engine bleeds trip off while passing through FL390. We received the Cabin Altitude warning and did the emergency action items and QRH. We asked for an emergency descent to 10;000 FT. We were able to keep the cabin altitude around approximately 10;000 FT. The passenger oxygen masks did not deploy. Using the QRH we were able to reset both of the engine bleeds and the cabin altitude returned to normal. I was informed that most of the passengers were not aware of the situation until I informed them during the descent. I am not aware of any passenger issues as a result of this event.

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.