A B727-200 in climb at FL240 declared an emergency and descended to 15000 ft due to loss of cabin pressure in automatic mode. Standby mode regained cabin pressure control and returned to assigned altitude.

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Attributes
ACN	528695
Time
Date	200110
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 24000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time type : 1247
ASRS Report	528695
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin alt warning horn other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude flight crew : declared emergency flight crew : regained aircraft control none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Passing FL240, cabin pressure altitude alarm activated. Captain declared an emergency and had me (the first officer) begin a descent to 15000 ft while the so switched the controller to standby and regained control of the cabin altitude. After control of the cabin was assured, we climbed back to altitude and proceeded to ZZZ1. Maximum cabin altitude was about 10200 ft for about 2 mins. The passenger's oxygen masks did not deploy.

Original NASA ASRS Text

Title: A B727-200 IN CLB AT FL240 DECLARED AN EMER AND DSNDED TO 15000 FT DUE TO LOSS OF CABIN PRESSURE IN AUTO MODE. STANDBY MODE REGAINED CABIN PRESSURE CTL AND RETURNED TO ASSIGNED ALT.

Narrative: PASSING FL240, CABIN PRESSURE ALT ALARM ACTIVATED. CAPT DECLARED AN EMER AND HAD ME (THE FO) BEGIN A DSCNT TO 15000 FT WHILE THE SO SWITCHED THE CTLR TO STANDBY AND REGAINED CTL OF THE CABIN ALT. AFTER CTL OF THE CABIN WAS ASSURED, WE CLBED BACK TO ALT AND PROCEEDED TO ZZZ1. MAX CABIN ALT WAS ABOUT 10200 FT FOR ABOUT 2 MINS. THE PAX'S OXYGEN MASKS DID NOT DEPLOY.

Data retrieved from NASA's ASRS site as of July 2007 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.