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Air carrier X undershot altitude crossing restriction. Situation: large transport type aircraft unable to comply with dowst crossing restriction during hot WX.
| Attributes | |
| ACN | 153285 |
| Time | |
| Date | 199008 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pom |
| State Reference | CA |
| Altitude | msl bound lower : 13000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ont tower : lga |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 9000 flight time type : 600 |
| ASRS Report | 153285 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met non adherence : published procedure non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Ont pom 4 departure restriction 'cross dowst at 14000'.' ont ATIS says to advise tower if unable to meet dowst altitude. Dowst is about 28 NM from ont. Air carrier X departed ont runway 26R at 96% of our maximum gross weight. We thought the aircraft was climbing well until we flew into an inversion of warmer air at which time the rate of climb fell off. We advised ont departure control 'we're unable dowst' at 14000', and they told us to climb and maintain 13000'. The large transport does not have on board equipment to show performance projections and crews are not aware of inversion performance effects. We're unable to determine before takeoff if able dowst at 14000'.
Original NASA ASRS Text
Title: ACR X UNDERSHOT ALT CROSSING RESTRICTION. SITUATION: LGT TYPE ACFT UNABLE TO COMPLY WITH DOWST CROSSING RESTRICTION DURING HOT WX.
Narrative: ONT POM 4 DEP RESTRICTION 'CROSS DOWST AT 14000'.' ONT ATIS SAYS TO ADVISE TWR IF UNABLE TO MEET DOWST ALT. DOWST IS ABOUT 28 NM FROM ONT. ACR X DEPARTED ONT RWY 26R AT 96% OF OUR MAX GROSS WT. WE THOUGHT THE ACFT WAS CLBING WELL UNTIL WE FLEW INTO AN INVERSION OF WARMER AIR AT WHICH TIME THE RATE OF CLB FELL OFF. WE ADVISED ONT DEP CTL 'WE'RE UNABLE DOWST' AT 14000', AND THEY TOLD US TO CLB AND MAINTAIN 13000'. THE LGT DOES NOT HAVE ON BOARD EQUIP TO SHOW PERFORMANCE PROJECTIONS AND CREWS ARE NOT AWARE OF INVERSION PERFORMANCE EFFECTS. WE'RE UNABLE TO DETERMINE BEFORE TKOF IF ABLE DOWST AT 14000'.
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.