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A lockheed T33 reported airspeed and altimeter errors due to crimped pitot static lines caused by the armament door hinges.
| Attributes | |
| ACN | 520342 |
| Time | |
| Date | 200107 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Shooting Star |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : takeoff ground : preflight ground : taxi |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | other |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : inspection authority technician : airframe |
| Experience | maintenance technician : 25 |
| ASRS Report | 520342 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 16200 flight time type : 45 |
| ASRS Report | 520343 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : airspeed altimeter errors other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Airspeed appeared to be working properly in ranges but difficulty in acceleration and increase in landing distance and takeoff distance and altimeter indications. First actions were to clean pitot head. Debris was found. A test flight after still showed the same problem. Further investigation revealed a loose bracket which allowed pitot and static lines to be crimped by armament door hinges. Possible erroneous airspeed indications and altitude indications. Aircraft was operated day VFR.
Original NASA ASRS Text
Title: A LOCKHEED T33 RPTED AIRSPD AND ALTIMETER ERRORS DUE TO CRIMPED PITOT STATIC LINES CAUSED BY THE ARMAMENT DOOR HINGES.
Narrative: AIRSPD APPEARED TO BE WORKING PROPERLY IN RANGES BUT DIFFICULTY IN ACCELERATION AND INCREASE IN LNDG DISTANCE AND TKOF DISTANCE AND ALTIMETER INDICATIONS. FIRST ACTIONS WERE TO CLEAN PITOT HEAD. DEBRIS WAS FOUND. A TEST FLT AFTER STILL SHOWED THE SAME PROB. FURTHER INVESTIGATION REVEALED A LOOSE BRACKET WHICH ALLOWED PITOT AND STATIC LINES TO BE CRIMPED BY ARMAMENT DOOR HINGES. POSSIBLE ERRONEOUS AIRSPD INDICATIONS AND ALT INDICATIONS. ACFT WAS OPERATED DAY VFR.
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.