Mechanic reports a B767-300 had an air turnback for left hydraulic quantity decreasing from hydrauli...

Attributes
ACN	809246
Time
Date	200807
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	other
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
ASRS Report	809246
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : briefing performance deficiency : logbook entry performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Company
Primary Problem	Maintenance Human Performance

Narrative:

On the day of jul/xa/08; along with fellow amt's; went out to meet aircraft because of an air turn back for left hydraulic quantity decreasing. Due to hydraulic leak; had to pin landing gear and do inspection. At this time no tires were deflated. After walkaround; 1 main gear tire started to deflate. Informed crew which was going to taxi to gate. After 10 mins second tire deflated. At this time the aircraft had to remain on the active runway until both tires were changed. Did inspection of main gear brakes before changing tires. Aircraft was towed to gate at terminal and hydraulic leak was worked on. Callback conversation with reporter revealed the following information: reporter stated he was informed months after the B767-300 air turnback incident; that he did not make an entry into the logbook stating he had accomplished a high energy stop inspection of the main landing gears; brakes and tires. Reporter stated that was the first thing they did; along with installing the gear pins for safety reasons prior to towing the aircraft. The brakes were really hot and the overheat fuse plugs on the two main tires melted causing the tires to deflate right there on the active runway. They had to change both tires prior to moving the B767.

Original NASA ASRS Text

Title: MECHANIC REPORTS A B767-300 HAD AN AIR TURNBACK FOR LEFT HYDRAULIC QUANTITY DECREASING FROM HYDRAULIC LEAK. SHORTLY AFTER MEETING AIRCRAFT ON ACTIVE RUNWAY; TWO MAIN GEAR TIRES OVERHEATED AND DEFLATED.

Narrative: ON THE DAY OF JUL/XA/08; ALONG WITH FELLOW AMT'S; WENT OUT TO MEET ACFT BECAUSE OF AN AIR TURN BACK FOR L HYD QUANTITY DECREASING. DUE TO HYD LEAK; HAD TO PIN LNDG GEAR AND DO INSPECTION. AT THIS TIME NO TIRES WERE DEFLATED. AFTER WALKAROUND; 1 MAIN GEAR TIRE STARTED TO DEFLATE. INFORMED CREW WHICH WAS GOING TO TAXI TO GATE. AFTER 10 MINS SECOND TIRE DEFLATED. AT THIS TIME THE ACFT HAD TO REMAIN ON THE ACTIVE RWY UNTIL BOTH TIRES WERE CHANGED. DID INSPECTION OF MAIN GEAR BRAKES BEFORE CHANGING TIRES. ACFT WAS TOWED TO GATE AT TERMINAL AND HYD LEAK WAS WORKED ON. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED HE WAS INFORMED MONTHS AFTER THE B767-300 AIR TURNBACK INCIDENT; THAT HE DID NOT MAKE AN ENTRY INTO THE LOGBOOK STATING HE HAD ACCOMPLISHED A HIGH ENERGY STOP INSPECTION OF THE MAIN LANDING GEARS; BRAKES AND TIRES. REPORTER STATED THAT WAS THE FIRST THING THEY DID; ALONG WITH INSTALLING THE GEAR PINS FOR SAFETY REASONS PRIOR TO TOWING THE AIRCRAFT. THE BRAKES WERE REALLY HOT AND THE OVERHEAT FUSE PLUGS ON THE TWO MAIN TIRES MELTED CAUSING THE TIRES TO DEFLATE RIGHT THERE ON THE ACTIVE RUNWAY. THEY HAD TO CHANGE BOTH TIRES PRIOR TO MOVING THE B767.

Data retrieved from NASA's ASRS site as of May 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.

Mechanic reports a B767-300 had an air turnback for left hydraulic quantity decreasing from hydraulic leak. Shortly after meeting aircraft on active runway; two main gear tires overheated and deflated.