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Medium large transport air carrier aircraft unable to maintain cruise speed at assigned high altitude resulting in descent to lower altitude.
| Attributes | |
| ACN | 247828 |
| Time | |
| Date | 199307 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 18000 flight time type : 15000 |
| ASRS Report | 247828 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Summer day, heavy aircraft. Cleared to FL350. Ok according to charts. Aircraft would not hold speed at cruise. Pushed power up to maximum climb EPR. Speed eased back up. Went to 330 for cruise. On hot summer days when temperature is above standard, engineering says the charts cannot be relied on. Company needs to note this on charts or work out a method to correct numbers for non standard temperatures. A common problem on the medium large transport aircraft.
Original NASA ASRS Text
Title: MLG ACR ACFT UNABLE TO MAINTAIN CRUISE SPD AT ASSIGNED HIGH ALT RESULTING IN DSCNT TO LOWER ALT.
Narrative: SUMMER DAY, HVY ACFT. CLRED TO FL350. OK ACCORDING TO CHARTS. ACFT WOULD NOT HOLD SPD AT CRUISE. PUSHED PWR UP TO MAX CLB EPR. SPD EASED BACK UP. WENT TO 330 FOR CRUISE. ON HOT SUMMER DAYS WHEN TEMP IS ABOVE STANDARD, ENGINEERING SAYS THE CHARTS CANNOT BE RELIED ON. COMPANY NEEDS TO NOTE THIS ON CHARTS OR WORK OUT A METHOD TO CORRECT NUMBERS FOR NON STANDARD TEMPS. A COMMON PROB ON THE MLG ACFT.
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.