An air carrier medium large transport climbed in response to a TCASII command.

Attributes
ACN	242537
Time
Date	199305
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : geg
State Reference	WA
Altitude	msl bound lower : 5500 msl bound upper : 5900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : geg
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft
Person 1
Affiliation	company : air carrier
Function	flight crew : captain observation : company check pilot oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 9500 flight time type : 1500
ASRS Report	242537
Person 2
Affiliation	company : air carrier
Function	flight crew : captain instruction : trainee
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 400 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Radar vectors for visual approach at geg, runway 7 (3-21 closed),heading 270 degrees cleared to descend to 5500 ft MSL. Approach pointed out VFR traffic (small aircraft) at approximately 1 O'clock climbing through 3500 ft. We could not make visual contact, but were able to observe him on our TCASII (incorporated in ehsi). Approach was talking to him on different frequency. We heard approach ask him to what altitude he was climbing. Since we were on a different frequency, we did not hear response. His readout on our TCASII was a climbing readout 3800 ft, 3900 ft, 4000 ft. Our TCASII gave yellow traffic warning. Suddenly his readout went to 5000 ft (we were at 5700-5800 ft) and we received a 'climb, climb' RA. We followed RA and received 'clear of conflict' at 5900 ft. We reported the RA to ATC. He stated that in accordance with his radar, adequate separation was available. We did not leave assigned altitude nor did we deviate from any clearance. Uneventful landing made. I telephoned approach control after arrival and we agreed that there was no problem. However, small aircraft later stated he was filing a NASA report. So, here is mine. Recommendation: approach control was not busy. All aircraft should be on same frequency if approaching an airport on a VFR day.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: RADAR VECTORS FOR VISUAL APCH AT GEG, RWY 7 (3-21 CLOSED),HDG 270 DEGS CLRED TO DSND TO 5500 FT MSL. APCH POINTED OUT VFR TFC (SMALL ACFT) AT APPROX 1 O'CLOCK CLBING THROUGH 3500 FT. WE COULD NOT MAKE VISUAL CONTACT, BUT WERE ABLE TO OBSERVE HIM ON OUR TCASII (INCORPORATED IN EHSI). APCH WAS TALKING TO HIM ON DIFFERENT FREQ. WE HEARD APCH ASK HIM TO WHAT ALT HE WAS CLBING. SINCE WE WERE ON A DIFFERENT FREQ, WE DID NOT HEAR RESPONSE. HIS READOUT ON OUR TCASII WAS A CLBING READOUT 3800 FT, 3900 FT, 4000 FT. OUR TCASII GAVE YELLOW TFC WARNING. SUDDENLY HIS READOUT WENT TO 5000 FT (WE WERE AT 5700-5800 FT) AND WE RECEIVED A 'CLB, CLB' RA. WE FOLLOWED RA AND RECEIVED 'CLR OF CONFLICT' AT 5900 FT. WE RPTED THE RA TO ATC. HE STATED THAT IN ACCORDANCE WITH HIS RADAR, ADEQUATE SEPARATION WAS AVAILABLE. WE DID NOT LEAVE ASSIGNED ALT NOR DID WE DEVIATE FROM ANY CLRNC. UNEVENTFUL LNDG MADE. I TELEPHONED APCH CTL AFTER ARR AND WE AGREED THAT THERE WAS NO PROB. HOWEVER, SMALL ACFT LATER STATED HE WAS FILING A NASA RPT. SO, HERE IS MINE. RECOMMENDATION: APCH CTL WAS NOT BUSY. ALL ACFT SHOULD BE ON SAME FREQ IF APCHING AN ARPT ON A VFR DAY.

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.