 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A block altitude is deviated from when the crew has a problem with clearance interpretation because of HF use on their extended overwater operation.
| Attributes | |
| ACN | 439440 |
| Time | |
| Date | 199906 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : zoa.artcc |
| State Reference | CA |
| Altitude | msl bound lower : 37000 msl bound upper : 37500 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Thunderstorm Turbulence |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other |
| Flight Phase | cruise : level |
| Route In Use | enroute : pacific |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : multi engine pilot : instrument |
| Experience | flight time last 90 days : 240 flight time total : 21000 flight time type : 3000 |
| ASRS Report | 439440 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : turbulence inflight encounter : weather non adherence : clearance non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : became reoriented flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | Weather Flight Crew Human Performance FAA Environmental Factor Airspace Structure Company |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
2 pilots of a 4 man crew received block altitude clearance FL350-FL370. I left the cockpit for a min and then returned to find we were at FL375. Other pilot thought clearance was for block altitude FL350-FL390. WX in the area, trying to find smooth air. Corrected altitude to comply with clearance. Center/pilot data link communication satellite was OTS. HF radio position reports used in lieu of center/pilot data link communication.
Original NASA ASRS Text
Title: A BLOCK ALT IS DEVIATED FROM WHEN THE CREW HAS A PROB WITH CLRNC INTERP BECAUSE OF HF USE ON THEIR EXTENDED OVERWATER OP.
Narrative: 2 PLTS OF A 4 MAN CREW RECEIVED BLOCK ALT CLRNC FL350-FL370. I LEFT THE COCKPIT FOR A MIN AND THEN RETURNED TO FIND WE WERE AT FL375. OTHER PLT THOUGHT CLRNC WAS FOR BLOCK ALT FL350-FL390. WX IN THE AREA, TRYING TO FIND SMOOTH AIR. CORRECTED ALT TO COMPLY WITH CLRNC. CTR/PLT DATA LINK COM SATELLITE WAS OTS. HF RADIO POS RPTS USED IN LIEU OF CTR/PLT DATA LINK COM.
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.