<< >> NASA ASRS Report 1372746, July 2016

B737-700 flight crew reported they noticed loss of cabin pressure on descent that was remedied by selecting the manual system.

Attributes
ACN	1372746
Time
Date	201607
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
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	Pressurization Control System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 172
Person 2
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 109
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

In an enroute descent. At approximately FL300; we got an altitude warn horn along with an altitude warning light. We noticed our cabin pressure to be at 10;000 ft. We immediately donned our oxygen masks and began the qrc checklist for loss of cabin pressure. At this time we [advised ATC] and continued descent to 10;000 ft. Through running the qrc checklist; we were able to regain control of the cabin pressure after selecting man on the pressure controller. At this point we continued to control cabin pressure manually and descend for a visual approach. In the descent we talked with the flight attendants to check on their (and passengers) wellbeing. They didn't even know anything had happened. However; a couple of passengers complained about their ears popping. We landed; taxied clear; and continued to the gate uneventfully.

Related reports:

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Original NASA ASRS Text

Title: B737-700 flight crew reported they noticed loss of cabin pressure on descent that was remedied by selecting the manual system.

Narrative: In an enroute descent. At approximately FL300; we got an altitude warn horn along with an altitude warning light. We noticed our cabin pressure to be at 10;000 ft. We immediately donned our oxygen masks and began the QRC Checklist for Loss of Cabin Pressure. At this time we [advised ATC] and continued descent to 10;000 ft. Through running the QRC Checklist; we were able to regain control of the cabin pressure after selecting MAN on the pressure controller. At this point we continued to control cabin pressure manually and descend for a visual approach. In the descent we talked with the Flight Attendants to check on their (and passengers) wellbeing. They didn't even know anything had happened. However; a couple of passengers complained about their ears popping. We landed; taxied clear; and continued to the gate uneventfully.

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.