 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A cpr DH6 flight crew lost control of the aircraft during an attempted landing in a crosswind that was near the maximum demonstrated.
| Attributes | |
| ACN | 401168 |
| Time | |
| Date | 199804 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Twin Otter DHC-6 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | landing other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 110 flight time total : 7000 flight time type : 2500 |
| ASRS Report | 401168 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | inflight encounter other other anomaly other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : unable other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In DHC6 twin otter on return to san jose, ca, on apr/thu/98, as PNF. Aircraft was in position for landing on runway 12R with wind reported 190 degrees at 15 KTS gusting 20 KTS. Flaps 10 degrees. The landing was being made with new captain, recently hired and trained. Briefed approach with crosswind landing and elected to land runway 12R for more safety. Upon touchdown with runway and rollout gust of wind blew aircraft to 45 degree angle and while brakes were still being applied, aircraft went off runway 12R into grass. No damage or injuries resulted to aircraft, crew, or passenger. Proper crosswind landing techniques were used and briefed prior to touchdown. As PNF, touchdown was made and I expected brakes and reverse propellers to be applied immediately while I assisted with ailerons into the wind. After approximately 2 seconds I was about to call out brakes and to slow the aircraft when airplane WX vaned into wind, and off runway at approximately 10-15 KTS. If there had been corrective action at this time, aircraft could have become unmanageable (induced oscillations). Pilot applied good judgement in controling aircraft as it went off runway 12R. Tower then asked if everything was ok and my response was 'everything was ok here and we were getting back on runway.' no damage to aircraft upon inspection. Crosswind limits have been demonstrated by afm at 90 degrees 20 KTS with flaps 37 1/2 degrees.
Original NASA ASRS Text
Title: A CPR DH6 FLC LOST CTL OF THE ACFT DURING AN ATTEMPTED LNDG IN A XWIND THAT WAS NEAR THE MAX DEMONSTRATED.
Narrative: IN DHC6 TWIN OTTER ON RETURN TO SAN JOSE, CA, ON APR/THU/98, AS PNF. ACFT WAS IN POS FOR LNDG ON RWY 12R WITH WIND RPTED 190 DEGS AT 15 KTS GUSTING 20 KTS. FLAPS 10 DEGS. THE LNDG WAS BEING MADE WITH NEW CAPT, RECENTLY HIRED AND TRAINED. BRIEFED APCH WITH XWIND LNDG AND ELECTED TO LAND RWY 12R FOR MORE SAFETY. UPON TOUCHDOWN WITH RWY AND ROLLOUT GUST OF WIND BLEW ACFT TO 45 DEG ANGLE AND WHILE BRAKES WERE STILL BEING APPLIED, ACFT WENT OFF RWY 12R INTO GRASS. NO DAMAGE OR INJURIES RESULTED TO ACFT, CREW, OR PAX. PROPER XWIND LNDG TECHNIQUES WERE USED AND BRIEFED PRIOR TO TOUCHDOWN. AS PNF, TOUCHDOWN WAS MADE AND I EXPECTED BRAKES AND REVERSE PROPS TO BE APPLIED IMMEDIATELY WHILE I ASSISTED WITH AILERONS INTO THE WIND. AFTER APPROX 2 SECONDS I WAS ABOUT TO CALL OUT BRAKES AND TO SLOW THE ACFT WHEN AIRPLANE WX VANED INTO WIND, AND OFF RWY AT APPROX 10-15 KTS. IF THERE HAD BEEN CORRECTIVE ACTION AT THIS TIME, ACFT COULD HAVE BECOME UNMANAGEABLE (INDUCED OSCILLATIONS). PLT APPLIED GOOD JUDGEMENT IN CTLING ACFT AS IT WENT OFF RWY 12R. TWR THEN ASKED IF EVERYTHING WAS OK AND MY RESPONSE WAS 'EVERYTHING WAS OK HERE AND WE WERE GETTING BACK ON RWY.' NO DAMAGE TO ACFT UPON INSPECTION. XWIND LIMITS HAVE BEEN DEMONSTRATED BY AFM AT 90 DEGS 20 KTS WITH FLAPS 37 1/2 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.