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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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TRACON supervisor working the departure controller position cleared an air carrier jet to 10000 ft after takeoff. The air carrier climbed to 1900 ft then descended to 1500 ft and was getting close to an obstruction that is at 1160 ft. Reporter questioned the air carrier who had misunderstood his clearance was to 1000 ft not 10000 ft. The reporter believes that this was a careless misinterp of clearance that was not caught by the controller due to the flight crew not reading back his clearance, only reading back his squawk code.
| Attributes | |
| ACN | 355708 |
| Time | |
| Date | 199612 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : roc |
| State Reference | NY |
| Altitude | msl bound lower : 1000 msl bound upper : 1900 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : roc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Route In Use | departure other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure oversight : supervisor |
| Qualification | controller : radar |
| Experience | controller non radar : 15 controller radar : 14 controller supervisory : 8 |
| ASRS Report | 355708 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 25000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Pilot obtained clearance from clearance delivery which included 'climb and maintain 10000 ft.' pilot only read back squawk. On departure, aircraft climbed to 1900 ft then descended to 1500 ft. On initial contact I told the pilot to climb and maintain 10000 ft. I later questioned the pilot and he said he thought his assigned altitude was 1000 ft and that he had busted it. I believe this was a careless mistake that could have been avoided if the crew had read back their clearance when it was issued. Note: there was an obstruction within 5 mi at 1160 ft MSL.
Original NASA ASRS Text
Title: TRACON SUPVR WORKING THE DEP CTLR POS CLRED AN ACR JET TO 10000 FT AFTER TKOF. THE ACR CLBED TO 1900 FT THEN DSNDED TO 1500 FT AND WAS GETTING CLOSE TO AN OBSTRUCTION THAT IS AT 1160 FT. RPTR QUESTIONED THE ACR WHO HAD MISUNDERSTOOD HIS CLRNC WAS TO 1000 FT NOT 10000 FT. THE RPTR BELIEVES THAT THIS WAS A CARELESS MISINTERP OF CLRNC THAT WAS NOT CAUGHT BY THE CTLR DUE TO THE FLC NOT READING BACK HIS CLRNC, ONLY READING BACK HIS SQUAWK CODE.
Narrative: PLT OBTAINED CLRNC FROM CLRNC DELIVERY WHICH INCLUDED 'CLB AND MAINTAIN 10000 FT.' PLT ONLY READ BACK SQUAWK. ON DEP, ACFT CLBED TO 1900 FT THEN DSNDED TO 1500 FT. ON INITIAL CONTACT I TOLD THE PLT TO CLB AND MAINTAIN 10000 FT. I LATER QUESTIONED THE PLT AND HE SAID HE THOUGHT HIS ASSIGNED ALT WAS 1000 FT AND THAT HE HAD BUSTED IT. I BELIEVE THIS WAS A CARELESS MISTAKE THAT COULD HAVE BEEN AVOIDED IF THE CREW HAD READ BACK THEIR CLRNC WHEN IT WAS ISSUED. NOTE: THERE WAS AN OBSTRUCTION WITHIN 5 MI AT 1160 FT MSL.
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.