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A lear 60 reports thrust reverser accumulator system over-pressure but is not reported to maintenance or entered in logbook for correction.
| Attributes | |
| ACN | 530126 |
| Time | |
| Date | 200111 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | Learjet 60 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7100 flight time type : 1300 |
| ASRS Report | 530126 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : accumulator press ind other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Chart Or Publication Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
During our post-flight inspection, we bled the hydraulic system pressure and checked the accumulator. The LR60 has a thrust reverser and system accumulator both normally pre-charged to 850 psi. The gauges indicated around 1500 psi each. We had been monitoring the system closely for the past several days and this was the first time we had seen them that high. Maintenance was called out to correct the situation. The thrust reverser accumulator gauge was sticking and was replaced, but maintenance also said there was an over-pressure issue. We flew 3 legs that day with a 2 hour stopover at a maintenance base where we got several position lights replaced. We did not request or talk to anyone about servicing the accumulators. The normal pre-charge of 850 psi is at the top of the yellow arc on the gauges.
Original NASA ASRS Text
Title: A LEAR 60 RPTS THRUST REVERSER ACCUMULATOR SYS OVER-PRESSURE BUT IS NOT RPTED TO MAINT OR ENTERED IN LOGBOOK FOR CORRECTION.
Narrative: DURING OUR POST-FLT INSPECTION, WE BLED THE HYD SYS PRESSURE AND CHKED THE ACCUMULATOR. THE LR60 HAS A THRUST REVERSER AND SYS ACCUMULATOR BOTH NORMALLY PRE-CHARGED TO 850 PSI. THE GAUGES INDICATED AROUND 1500 PSI EACH. WE HAD BEEN MONITORING THE SYS CLOSELY FOR THE PAST SEVERAL DAYS AND THIS WAS THE FIRST TIME WE HAD SEEN THEM THAT HIGH. MAINT WAS CALLED OUT TO CORRECT THE SIT. THE THRUST REVERSER ACCUMULATOR GAUGE WAS STICKING AND WAS REPLACED, BUT MAINT ALSO SAID THERE WAS AN OVER-PRESSURE ISSUE. WE FLEW 3 LEGS THAT DAY WITH A 2 HR STOPOVER AT A MAINT BASE WHERE WE GOT SEVERAL POS LIGHTS REPLACED. WE DID NOT REQUEST OR TALK TO ANYONE ABOUT SVCING THE ACCUMULATORS. THE NORMAL PRE-CHARGE OF 850 PSI IS AT THE TOP OF THE YELLOW ARC ON THE GAUGES.
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.