A leveling B727-200 loses its cabin pressurization with the captain declaring an emergency during descent. The so discovers the left pack turned off. Mia, fl.

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Attributes
ACN	469363
Time
Date	200004
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	msl single value : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	469363
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	469129
Events
Anomaly	aircraft equipment problem : critical non adherence : company policies non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin alt alert other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem flight crew : became reoriented
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Leveling at FL270, captain flying. Crew heard cabin altitude alarm. Flight engineer initiated depressurization procedures, closed cargo heat valve. At same time, captain pulled back power to cruise and cabin altitude appeared to climb. Captain ordered oxygen and, to be on the safe side, initiated descent with mia and declared an emergency. With throttles now at idle, flight engineer discovered he had inadvertently turned off the left pack. He advised the captain and I added power to slow descent and give him air to regain control of pressurization. Terminated emergency with ZMA, climbed back to altitude, and continued to lrm without further problem. Lesson learned. Don't pull back power too soon -- it delays pressurization recovery. Supplemental information from acn 469130: I noted the time and conditions of the occurrence and deduced that the pack was turned off during the climb.

Original NASA ASRS Text

Title: A LEVELING B727-200 LOSES ITS CABIN PRESSURIZATION WITH THE CAPT DECLARING AN EMER DURING DSCNT. THE SO DISCOVERS THE L PACK TURNED OFF. MIA, FL.

Narrative: LEVELING AT FL270, CAPT FLYING. CREW HEARD CABIN ALT ALARM. FE INITIATED DEPRESSURIZATION PROCS, CLOSED CARGO HEAT VALVE. AT SAME TIME, CAPT PULLED BACK PWR TO CRUISE AND CABIN ALT APPEARED TO CLB. CAPT ORDERED OXYGEN AND, TO BE ON THE SAFE SIDE, INITIATED DSCNT WITH MIA AND DECLARED AN EMER. WITH THROTTLES NOW AT IDLE, FE DISCOVERED HE HAD INADVERTENTLY TURNED OFF THE L PACK. HE ADVISED THE CAPT AND I ADDED PWR TO SLOW DSCNT AND GIVE HIM AIR TO REGAIN CTL OF PRESSURIZATION. TERMINATED EMER WITH ZMA, CLBED BACK TO ALT, AND CONTINUED TO LRM WITHOUT FURTHER PROB. LESSON LEARNED. DON'T PULL BACK PWR TOO SOON -- IT DELAYS PRESSURIZATION RECOVERY. SUPPLEMENTAL INFO FROM ACN 469130: I NOTED THE TIME AND CONDITIONS OF THE OCCURRENCE AND DEDUCED THAT THE PACK WAS TURNED OFF DURING THE CLB.

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.