Flight crew of a B727 experienced a loss of cabin pressurization and declared an emergency to descend and divert to land. Passenger masks dropped when cabin reached 14000 ft. Crew had already donned oxygen masks prior to emergency descent.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	407765
Time
Date	199807
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : lbf airport : lnk
State Reference	NE
Altitude	msl bound lower : 35800 msl bound upper : 35800
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude other
Route In Use	enroute airway : zdv
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	other other : other pilot : instrument pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 4500
ASRS Report	407765
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 130 flight time total : 10000
ASRS Report	407620
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Climbing through FL356, #3 bleed trip off light illuminated and associated bleed valve closed. Captain confirmed cabin altitude stable (approximately 100-300 FPM roc), requested descent from ATC, xferred controls to first officer and began working on checklist to resolve problem with so. Within 45-60 seconds of first light, left air conditioning pack overheated (despite so's attempt to control it by going to manual and selecting a warmer temperature) and the pack tripped. Without even looking, I could tell we were in a rapid depressurization (physical symptoms). Captain immediately called for oxygen masks and emergency descent. He declared an emergency, coordinated descent with ATC and worked on checklists, with so. Decision to divert to lnk vice destination (dsm) made due to fuel state and doubts regarding pressurization (so had regained control by following checklists). Landed with 11800 pounds of fuel. No passenger or crew reporting ill-effects. (Oxygen masks had deployed at 14000 ft cabin altitude. Have no idea how high the cabin altitude actually got.) after landing, #3 bleed trip light again illuminated, could not reset. No recommendations for prevention. A mechanical problem in two bad places on the pressurization system compounded to make a worse scenario.

Original NASA ASRS Text

Title: FLC OF A B727 EXPERIENCED A LOSS OF CABIN PRESSURIZATION AND DECLARED AN EMER TO DSND AND DIVERT TO LAND. PAX MASKS DROPPED WHEN CABIN REACHED 14000 FT. CREW HAD ALREADY DONNED OXYGEN MASKS PRIOR TO EMER DSCNT.

Narrative: CLBING THROUGH FL356, #3 BLEED TRIP OFF LIGHT ILLUMINATED AND ASSOCIATED BLEED VALVE CLOSED. CAPT CONFIRMED CABIN ALT STABLE (APPROX 100-300 FPM ROC), REQUESTED DSCNT FROM ATC, XFERRED CTLS TO FO AND BEGAN WORKING ON CHKLIST TO RESOLVE PROB WITH SO. WITHIN 45-60 SECONDS OF FIRST LIGHT, L AIR CONDITIONING PACK OVERHEATED (DESPITE SO'S ATTEMPT TO CTL IT BY GOING TO MANUAL AND SELECTING A WARMER TEMP) AND THE PACK TRIPPED. WITHOUT EVEN LOOKING, I COULD TELL WE WERE IN A RAPID DEPRESSURIZATION (PHYSICAL SYMPTOMS). CAPT IMMEDIATELY CALLED FOR OXYGEN MASKS AND EMER DSCNT. HE DECLARED AN EMER, COORDINATED DSCNT WITH ATC AND WORKED ON CHKLISTS, WITH SO. DECISION TO DIVERT TO LNK VICE DEST (DSM) MADE DUE TO FUEL STATE AND DOUBTS REGARDING PRESSURIZATION (SO HAD REGAINED CTL BY FOLLOWING CHKLISTS). LANDED WITH 11800 LBS OF FUEL. NO PAX OR CREW RPTING ILL-EFFECTS. (OXYGEN MASKS HAD DEPLOYED AT 14000 FT CABIN ALT. HAVE NO IDEA HOW HIGH THE CABIN ALT ACTUALLY GOT.) AFTER LNDG, #3 BLEED TRIP LIGHT AGAIN ILLUMINATED, COULD NOT RESET. NO RECOMMENDATIONS FOR PREVENTION. A MECHANICAL PROB IN TWO BAD PLACES ON THE PRESSURIZATION SYS COMPOUNDED TO MAKE A WORSE SCENARIO.

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.