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A saab-340F aircraft was found to have a #3 brake spinning with the tire after new tire installed.
| Attributes | |
| ACN | 731787 |
| Time | |
| Date | 200703 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | SF 340B |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 731787 |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On mar/sun/07 around XA00 at ZZZ; I was changing the #3 tire on a saab aircraft. I followed the work card and checked the brake to be fully back and locked. I replaced the #3 tire and signed it off; per the work card. On mar/mon/07 I became aware that aircraft was grounded because the brake was spinning with the tire. I was the only one changing that tire. I am not sure as to why that brake became loose. I had checked it and made sure it was locked in position. There should be a locking pin on the brake so that way it is secured in and there is no way of it becoming loose. The design for that is bad. Callback conversation with reporter revealed the following information: reporter stated this type of brake assembly does not use attach bolts or a locking ring to secure brake. Rather; a positioning groove is incorporated in the axle assembly and the mechanic is to 'slip' the brake into position. The tire is than installed with axle nut and locking bolts.
Original NASA ASRS Text
Title: A SAAB-340F ACFT WAS FOUND TO HAVE A #3 BRAKE SPINNING WITH THE TIRE AFTER NEW TIRE INSTALLED.
Narrative: ON MAR/SUN/07 AROUND XA00 AT ZZZ; I WAS CHANGING THE #3 TIRE ON A SAAB ACFT. I FOLLOWED THE WORK CARD AND CHKED THE BRAKE TO BE FULLY BACK AND LOCKED. I REPLACED THE #3 TIRE AND SIGNED IT OFF; PER THE WORK CARD. ON MAR/MON/07 I BECAME AWARE THAT ACFT WAS GNDED BECAUSE THE BRAKE WAS SPINNING WITH THE TIRE. I WAS THE ONLY ONE CHANGING THAT TIRE. I AM NOT SURE AS TO WHY THAT BRAKE BECAME LOOSE. I HAD CHECKED IT AND MADE SURE IT WAS LOCKED IN POSITION. THERE SHOULD BE A LOCKING PIN ON THE BRAKE SO THAT WAY IT IS SECURED IN AND THERE IS NO WAY OF IT BECOMING LOOSE. THE DESIGN FOR THAT IS BAD. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THIS TYPE OF BRAKE ASSEMBLY DOES NOT USE ATTACH BOLTS OR A LOCKING RING TO SECURE BRAKE. RATHER; A POSITIONING GROOVE IS INCORPORATED IN THE AXLE ASSEMBLY AND THE MECHANIC IS TO 'SLIP' THE BRAKE INTO POSITION. THE TIRE IS THAN INSTALLED WITH AXLE NUT AND LOCKING BOLTS.
Data retrieved from NASA's ASRS site as of January 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.