A B727 in cruise at FL310 declared an emergency and diverted due to loss of 'a' system hydraulic pressure and quantity caused by a split brake interconnect valve.

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Attributes
ACN	467284
Time
Date	200003
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia.airport
State Reference	FL
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : j79.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : instrument pilot : atp technician : powerplant technician : inspection authority technician : airframe
Experience	flight time last 90 days : 170 flight time total : 15500 flight time type : 5700
ASRS Report	467284
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : hydraulic press indicator other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Upon reaching FL310 at XA55Z aircraft experienced a total system 'a' hydraulic failure. Accomplished system 'a' hydraulics failure checklist in accordance with aom voluntary emergency procedure page. Accomplished in hold while returning for emergency landing at mia included cranking gear down manually. When called for alternate flap extension on the aircraft checklist we experienced a split flap, outboard flap 15 degrees inboard flap 0 degrees. Accomplished split flap checklist in accordance with aom voluntary emergency procedures page and returned to mia. Declared an emergency. Had deadheading crew onboard. Used flight engineer and captain to assist in troubleshooting and accomplishing the proper checklist and informing all crew members of situation. Landing was normal. Towed to the ramp after exiting runway. Failure was due to separation of brake interconnect valve. This was caused by overtorquing of bolts at overhaul shop vendor repair station.

Original NASA ASRS Text

Title: A B727 IN CRUISE AT FL310 DECLARED AN EMER AND DIVERTED DUE TO LOSS OF 'A' SYS HYD PRESSURE AND QUANTITY CAUSED BY A SPLIT BRAKE INTERCONNECT VALVE.

Narrative: UPON REACHING FL310 AT XA55Z ACFT EXPERIENCED A TOTAL SYS 'A' HYD FAILURE. ACCOMPLISHED SYS 'A' HYDS FAILURE CHKLIST IN ACCORDANCE WITH AOM VOLUNTARY EMER PROC PAGE. ACCOMPLISHED IN HOLD WHILE RETURNING FOR EMER LNDG AT MIA INCLUDED CRANKING GEAR DOWN MANUALLY. WHEN CALLED FOR ALTERNATE FLAP EXTENSION ON THE ACFT CHKLIST WE EXPERIENCED A SPLIT FLAP, OUTBOARD FLAP 15 DEGS INBOARD FLAP 0 DEGS. ACCOMPLISHED SPLIT FLAP CHKLIST IN ACCORDANCE WITH AOM VOLUNTARY EMER PROCS PAGE AND RETURNED TO MIA. DECLARED AN EMER. HAD DEADHEADING CREW ONBOARD. USED FE AND CAPT TO ASSIST IN TROUBLESHOOTING AND ACCOMPLISHING THE PROPER CHKLIST AND INFORMING ALL CREW MEMBERS OF SIT. LNDG WAS NORMAL. TOWED TO THE RAMP AFTER EXITING RWY. FAILURE WAS DUE TO SEPARATION OF BRAKE INTERCONNECT VALVE. THIS WAS CAUSED BY OVERTORQUING OF BOLTS AT OVERHAUL SHOP VENDOR REPAIR STATION.

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.