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Pilot reports during preflight; finding numerous B737-300/400 aircraft with aileron hydraulic flex lines rubbing against the tail PCU in fwd left wheel well.
| Attributes | |
| ACN | 741098 |
| Time | |
| Date | 200704 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 741098 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : hdy lines rubbing |
| Resolutory Action | other |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : engineering procedure performance deficiency : non compliance with legal requirements performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Concern over hydraulic lines being worn. While doing my normal preflight walkaround inspections the last few months; I have observed numerous aircraft; both B737 3+4 with hydraulic lines connected to the aileron power control unit. That may be a problem in the future. The PCU is located forward in the main wheel well forward and left of a system reservoir. The hydraulic lines; one clear and one white; connect from overhead the top PCU. These lines are rubbing against the PCU mechanisms and a lock nut with a cotter pin causing wear on these lines. Not all aircraft have shown wear. Some seemed to have been clamped so as to not rub; the lower PCU has the same type lines but I haven't observed much wear. I have pointed out my concerns to several mechanics at various stations in our system and they contacted maintenance control.
Original NASA ASRS Text
Title: PILOT REPORTS DURING PREFLIGHT; FINDING NUMEROUS B737-300/400 ACFT WITH AILERON HYD FLEX LINES RUBBING AGAINST THE TAIL PCU IN FWD LEFT WHEEL WELL.
Narrative: CONCERN OVER HYD LINES BEING WORN. WHILE DOING MY NORMAL PREFLT WALKAROUND INSPECTIONS THE LAST FEW MONTHS; I HAVE OBSERVED NUMEROUS ACFT; BOTH B737 3+4 WITH HYD LINES CONNECTED TO THE AILERON PWR CTL UNIT. THAT MAY BE A PROB IN THE FUTURE. THE PCU IS LOCATED FORWARD IN THE MAIN WHEEL WELL FORWARD AND L OF A SYS RESERVOIR. THE HYD LINES; ONE CLEAR AND ONE WHITE; CONNECT FROM OVERHEAD THE TOP PCU. THESE LINES ARE RUBBING AGAINST THE PCU MECHANISMS AND A LOCK NUT WITH A COTTER PIN CAUSING WEAR ON THESE LINES. NOT ALL ACFT HAVE SHOWN WEAR. SOME SEEMED TO HAVE BEEN CLAMPED SO AS TO NOT RUB; THE LOWER PCU HAS THE SAME TYPE LINES BUT I HAVEN'T OBSERVED MUCH WEAR. I HAVE POINTED OUT MY CONCERNS TO SEVERAL MECHS AT VARIOUS STATIONS IN OUR SYS AND THEY CONTACTED MAINT CTL.
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.