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Large transport on initial climb receives TCASII alert and traffic call from ATC with traffic same altitude. Increases climb rate but decreases airspeed below bug speed.
| Attributes | |
| ACN | 210407 |
| Time | |
| Date | 199205 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sna |
| State Reference | CA |
| Altitude | msl bound lower : 1000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial climbout : takeoff |
| Route In Use | departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 13000 flight time type : 200 |
| ASRS Report | 210407 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 400 flight time total : 6800 flight time type : 1200 |
| ASRS Report | 210283 |
| Events | |
| Anomaly | other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
On the departure in sna, the SID and company noise abatement procedure, for sna, dictated a climb with maximum takeoff power to 800 ft, then reduce to climb 2 power (20% below normal climb power). Then at 1 mi, turn left to a heading of 175. These 2 events happened at approximately the same time. During this departure with power being reduced, in a left turn, and lowering pitch to reduce climb, TCASII suddenly gave an oral alert. Looking at the TCASII, I saw that we were approaching the altitude of the traffic. Sna departure control then advised us of the traffic, now being at our altitude. I decided to increase climb rate to 500 ft above the traffic, with a slight increase in pitch. This action kept me away from a traffic conflict, on the SID, and quiet for a noise sensitive airport. The traffic was never seen and there was no conflict. Because of this, airspeed decreased below bug speed. As I was returning the airspeed to normal, the first officer called out the airspeed deviation. The remainder of the flight was normal. Supplemental information from acn 210283: the large transport is a quiet aircraft. The noise abatement procedure should be dropped for this aircraft.
Original NASA ASRS Text
Title: LGT ON INITIAL CLB RECEIVES TCASII ALERT AND TFC CALL FROM ATC WITH TFC SAME ALT. INCREASES CLB RATE BUT DECREASES AIRSPD BELOW BUG SPD.
Narrative: ON THE DEP IN SNA, THE SID AND COMPANY NOISE ABATEMENT PROC, FOR SNA, DICTATED A CLB WITH MAX TKOF PWR TO 800 FT, THEN REDUCE TO CLB 2 PWR (20% BELOW NORMAL CLB PWR). THEN AT 1 MI, TURN L TO A HDG OF 175. THESE 2 EVENTS HAPPENED AT APPROX THE SAME TIME. DURING THIS DEP WITH PWR BEING REDUCED, IN A L TURN, AND LOWERING PITCH TO REDUCE CLB, TCASII SUDDENLY GAVE AN ORAL ALERT. LOOKING AT THE TCASII, I SAW THAT WE WERE APCHING THE ALT OF THE TFC. SNA DEP CTL THEN ADVISED US OF THE TFC, NOW BEING AT OUR ALT. I DECIDED TO INCREASE CLB RATE TO 500 FT ABOVE THE TFC, WITH A SLIGHT INCREASE IN PITCH. THIS ACTION KEPT ME AWAY FROM A TFC CONFLICT, ON THE SID, AND QUIET FOR A NOISE SENSITIVE ARPT. THE TFC WAS NEVER SEEN AND THERE WAS NO CONFLICT. BECAUSE OF THIS, AIRSPD DECREASED BELOW BUG SPD. AS I WAS RETURNING THE AIRSPD TO NORMAL, THE FO CALLED OUT THE AIRSPD DEV. THE REMAINDER OF THE FLT WAS NORMAL. SUPPLEMENTAL INFO FROM ACN 210283: THE LGT IS A QUIET ACFT. THE NOISE ABATEMENT PROC SHOULD BE DROPPED FOR THIS 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.