<< >> NASA ASRS Report 733987, April 2007

B737-300 crew experiences cabin pressurization controller failure at 5000 feet during descent; and is able to manually control pressurization for landing.

Attributes
ACN	733987
Time
Date	200704
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : alb.airport
State Reference	NY
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : alb.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	733987
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Pressurization system failure. Descending into alb at approximately 5000 ft MSL the automatic pressure controller failed. We were unable to regain control with the standby system. We were able to control it with the manual system before landing. We felt and heard the depressurization and cockpit pressurization panel confirmed it. We followed procedures outlined in QRH. Controled cabin pressure manually. Cannot avoid this; it is a mechanical failure.

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Original NASA ASRS Text

Title: B737-300 CREW EXPERIENCES CABIN PRESSURIZATION CONTROLLER FAILURE AT 5000 FEET DURING DESCENT; AND IS ABLE TO MANUALLY CONTROL PRESSURIZATION FOR LANDING.

Narrative: PRESSURIZATION SYS FAILURE. DSNDING INTO ALB AT APPROX 5000 FT MSL THE AUTO PRESSURE CTLR FAILED. WE WERE UNABLE TO REGAIN CTL WITH THE STANDBY SYS. WE WERE ABLE TO CTL IT WITH THE MANUAL SYS BEFORE LNDG. WE FELT AND HEARD THE DEPRESSURIZATION AND COCKPIT PRESSURIZATION PANEL CONFIRMED IT. WE FOLLOWED PROCS OUTLINED IN QRH. CTLED CABIN PRESSURE MANUALLY. CANNOT AVOID THIS; IT IS A MECHANICAL FAILURE.

Data retrieved from NASA's ASRS site as of January 2009 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.