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Brakes fail when setting to disconnect tug at pushback.
| Attributes | |
| ACN | 223984 |
| Time | |
| Date | 199210 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | ground : preflight ground other : taxi other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 223984 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other |
| Independent Detector | other other : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
After pushback of large transport, all 4 brakes failed. (When they (crew) tried to set brakes to disconnect tractor.) the cause of failure determined by showing the deboost valve reset lever not in the green band area. During overnight visit of aircraft, I did bleed all brakes per maintenance manual, with another mechanic in control cabin. During and after bleeding, deboost valve reset lever remained at green band area.
Original NASA ASRS Text
Title: BRAKES FAIL WHEN SETTING TO DISCONNECT TUG AT PUSHBACK.
Narrative: AFTER PUSHBACK OF LGT, ALL 4 BRAKES FAILED. (WHEN THEY (CREW) TRIED TO SET BRAKES TO DISCONNECT TRACTOR.) THE CAUSE OF FAILURE DETERMINED BY SHOWING THE DEBOOST VALVE RESET LEVER NOT IN THE GREEN BAND AREA. DURING OVERNIGHT VISIT OF ACFT, I DID BLEED ALL BRAKES PER MAINT MANUAL, WITH ANOTHER MECH IN CTL CABIN. DURING AND AFTER BLEEDING, DEBOOST VALVE RESET LEVER REMAINED AT GREEN BAND AREA.
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.