<< >> NASA ASRS Report 1717740, January 2020

B737NG captain reported a failure of the cabin pressurization controller resulting in an immediate descent to 10;000 feet.

Attributes
ACN	1717740
Time
Date	202001
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 147 Flight Crew Type 14792
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

Auto fail light illuminated on the cabin pressurization controller. The alternate system for cabin pressurization controller did not engage. Landing alt and flight alt windows displayed 5 dashes. Cabin altitude was increasing. Selected manual to regain control of cabin. Advised ATC and requested immediate descent to 10;000 feet. Was able to regain control of the cabin with manual control and proceeded to and landed normally in ZZZZ.about 30 miles or so from ZZZ all smoke alarms sounded. We had no indication of any smoke or fire. Emergency vehicles met us on landing and one followed us to gate xx. Passengers deplaned normally. All faults entered into the elb (electronic logbook). This was not a rapid depressurization and no masks were deployed.

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Original NASA ASRS Text

Title: B737NG Captain reported a failure of the cabin pressurization Controller resulting in an immediate descent to 10;000 feet.

Narrative: Auto Fail light illuminated on the cabin pressurization controller. The Alternate system for cabin pressurization Controller did not engage. Landing Alt and Flight Alt windows displayed 5 dashes. Cabin Altitude was increasing. Selected manual to regain control of cabin. Advised ATC and requested immediate descent to 10;000 feet. Was able to regain control of the cabin with manual control and proceeded to and landed normally in ZZZZ.About 30 miles or so from ZZZ all smoke alarms sounded. We had no indication of any smoke or fire. Emergency vehicles met us on landing and one followed us to gate XX. Passengers deplaned normally. All faults entered into the ELB (Electronic Logbook). This was not a rapid depressurization and no masks were deployed.

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.