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Flight crew of a B737 stopped descent and climbed in response to a TCASII RA from a climbing DH6 twin otter with parachute jumpers.
| Attributes | |
| ACN | 473810 |
| Time | |
| Date | 200005 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : sac.vortac |
| State Reference | CA |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zoa.artcc tracon : mcc.tracon |
| Operator | Other |
| Make Model Name | Twin Otter DHC-6 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : instrument |
| Experience | controller radar : 10 controller time certified in position1 : 9 flight time total : 2000 |
| ASRS Report | 473810 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : provided flight assist flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 2500 vertical : 500 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure |
Narrative:
DH6 handed off by approach as it left 10000 ft climbing (approach owns down to 10000 ft). At handoff was parallel airway/arrival. Advised B737 of DH6. Attempted to get approach to stop climb of DH6, but they thought he was on my frequency. I asked on frequency if DH6 was on, he advised out of 12000 ft. I saw him in left turn toward B737. Advised DH6 of B737, and he said turning left. B737 said stopping descent for RA. DH6 did not cross, but came less than .5 mi of airway. B737 climbed above 13000 ft, then saw DH6. Continued uneventful. Asking approach to restrict jump aircraft below center airspace until handoff accepted or traffic issued has been tried. Pilot does not accept restrs.
Original NASA ASRS Text
Title: FLC OF A B737 STOPPED DSCNT AND CLBED IN RESPONSE TO A TCASII RA FROM A CLBING DH6 TWIN OTTER WITH PARACHUTE JUMPERS.
Narrative: DH6 HANDED OFF BY APCH AS IT LEFT 10000 FT CLBING (APCH OWNS DOWN TO 10000 FT). AT HDOF WAS PARALLEL AIRWAY/ARR. ADVISED B737 OF DH6. ATTEMPTED TO GET APCH TO STOP CLB OF DH6, BUT THEY THOUGHT HE WAS ON MY FREQ. I ASKED ON FREQ IF DH6 WAS ON, HE ADVISED OUT OF 12000 FT. I SAW HIM IN L TURN TOWARD B737. ADVISED DH6 OF B737, AND HE SAID TURNING L. B737 SAID STOPPING DSCNT FOR RA. DH6 DID NOT CROSS, BUT CAME LESS THAN .5 MI OF AIRWAY. B737 CLBED ABOVE 13000 FT, THEN SAW DH6. CONTINUED UNEVENTFUL. ASKING APCH TO RESTRICT JUMP ACFT BELOW CTR AIRSPACE UNTIL HDOF ACCEPTED OR TFC ISSUED HAS BEEN TRIED. PLT DOES NOT ACCEPT RESTRS.
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.