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A mcdonnell douglas widebody flight crew experienced a stick shaker and slas disag alert as the aircraft was slowed through 150 KTS during approach. A go-around is initiated and a second approach with higher vspeeds results in the same alerts and another go-around. The next approach is accomplished with the slats retracted to a successful landing.
| Attributes | |
| ACN | 1212315 |
| Time | |
| Date | 201410 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | McDonnell Douglas Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Leading Edge Slat |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Speed All Types Inflight Event / Encounter Fuel Issue |
Narrative:
We arrived with flight plan fuel of 17;000 pounds. During the ILS approach we weighed 325;000 pounds; we selected flaps 35; vapproach speed was 140 knots. When we slowed through 150 knots; we got stick shaker and slas disag alert. We did a go around and asked for another approach. We added speed for the second ILS approach. The new speed was 145 knots. During this approach; we got the same alert and stick shaker at the same place; 150 knots. We did a go around again. Next we executed the slats disag checklist. This prompted us to land flaps 22 with slats retracted. I; the captain now became the pilot flying. During our third approach we [advised ATC] because our fuel load was less than 11;000 pounds. For this approach the V approach speed was 188 knots. We touched down in the touchdown zone and applied light to moderate braking. During taxi in to the ramp; we received one brake overheat alert at 590. This slat disag problem became a repeat write up.
Original NASA ASRS Text
Title: A Mcdonnell Douglas widebody flight crew experienced a stick shaker and SLAS DISAG alert as the aircraft was slowed through 150 KTS during approach. A go-around is initiated and a second approach with higher Vspeeds results in the same alerts and another go-around. The next approach is accomplished with the slats retracted to a successful landing.
Narrative: We arrived with flight plan fuel of 17;000 pounds. During the ILS approach we weighed 325;000 pounds; we selected flaps 35; Vapproach speed was 140 knots. When we slowed through 150 knots; we got stick shaker and SLAS DISAG alert. We did a go around and asked for another approach. We added speed for the second ILS approach. The new speed was 145 knots. During this approach; we got the same alert and stick shaker at the same place; 150 knots. We did a go around again. Next we executed the SLATS DISAG checklist. This prompted us to land flaps 22 with slats retracted. I; the captain now became the pilot flying. During our third approach we [advised ATC] because our fuel load was less than 11;000 pounds. For this approach the V approach speed was 188 knots. We touched down in the touchdown zone and applied light to moderate braking. During taxi in to the ramp; we received one brake overheat alert at 590. This SLAT DISAG problem became a repeat write up.
Data retrieved from NASA's ASRS site 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.