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Stage III aircraft with hush kit modification (noise abatement), not authority/authorized flaps 50 degree landing because of excessive thrust (noise) required. Flaps 50 degrees used for landing because of aircraft weight and inability to go to alternate airport.
| Attributes | |
| ACN | 324590 |
| Time | |
| Date | 199601 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : mdw |
| State Reference | IL |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 8000 flight time type : 160 |
| ASRS Report | 324590 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 1600 |
| ASRS Report | 324708 |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | other |
Narrative:
DC9-30 stage III (hush kit modification) are certified for flaps 50 degrees landing in emergency only. Required engine thrust puts it out of stage III classification (noise). Upon arrival at midway we were too heavy to land on applicable runways. Landing runways changed after departure from msp (land flaps 40 degrees). Unable to burn down fuel to acceptable landing weight due to alternate requirement. Unable to contact dispatch to change alternate due to poor company radio coverage. Had to declare emergency and land flaps 50 degrees instead of flaps 40 degrees (weight within limits for flaps 50 degrees).
Original NASA ASRS Text
Title: STAGE III ACFT WITH HUSH KIT MODIFICATION (NOISE ABATEMENT), NOT AUTH FLAPS 50 DEG LNDG BECAUSE OF EXCESSIVE THRUST (NOISE) REQUIRED. FLAPS 50 DEGS USED FOR LNDG BECAUSE OF ACFT WT AND INABILITY TO GO TO ALTERNATE ARPT.
Narrative: DC9-30 STAGE III (HUSH KIT MODIFICATION) ARE CERTIFIED FOR FLAPS 50 DEGS LNDG IN EMER ONLY. REQUIRED ENG THRUST PUTS IT OUT OF STAGE III CLASSIFICATION (NOISE). UPON ARR AT MIDWAY WE WERE TOO HVY TO LAND ON APPLICABLE RWYS. LNDG RWYS CHANGED AFTER DEP FROM MSP (LAND FLAPS 40 DEGS). UNABLE TO BURN DOWN FUEL TO ACCEPTABLE LNDG WT DUE TO ALTERNATE REQUIREMENT. UNABLE TO CONTACT DISPATCH TO CHANGE ALTERNATE DUE TO POOR COMPANY RADIO COVERAGE. HAD TO DECLARE EMER AND LAND FLAPS 50 DEGS INSTEAD OF FLAPS 40 DEGS (WT WITHIN LIMITS FOR FLAPS 50 DEGS).
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.