<< >> NASA ASRS Report 191427, October 1991

Air carrier X TCASII RA evasive action taken from aircraft Y skydiving aircraft. See and avoid concept. Situation skydiving on airways.

Attributes
ACN	191427
Time
Date	199110
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : btg
State Reference	OR
Altitude	msl bound lower : 10000 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : pdx
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 1600
ASRS Report	191427
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 1000
ASRS Report	191430
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Air Traffic Incident	other
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Air carrier X descent into portland, on moxee 2 arrival at flowr intersection, we received an RA on TCASII. At first it was 'monitor vertical speed', we were straight and level 10000 ft, 250 KTS at that time. Then as we were cleared to descend to 5000 ft, we got a climb RA on TCASII. We climbed 300 ft (10300 ft MSL) before we got a 'clear of conflict' on TCASII. We advised ATC, they said no problem descend to 5000 ft. We had visual contact with only 1 of 2 conflicting aircraft. One was said by ATC to be aircraft Y that had just released parachutists at 10500 ft just in front of us. This is the aircraft we saw at flowr intersection during the conflict. He was below us (approximately 1000-2000 ft) in a 90 degree bank turn when sighted. We did not see the other traffic. My greatest concern is: why was an aircraft permitted to drop jumpers over flowr intersection at 10500 MSL? This arrival placed us over flowr at 10000 ft and 250 KTS.

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Original NASA ASRS Text

Title: ACR X TCASII RA EVASIVE ACTION TAKEN FROM ACFT Y SKYDIVING ACFT. SEE AND AVOID CONCEPT. SITUATION SKYDIVING ON AIRWAYS.

Narrative: ACR X DSCNT INTO PORTLAND, ON MOXEE 2 ARR AT FLOWR INTXN, WE RECEIVED AN RA ON TCASII. AT FIRST IT WAS 'MONITOR VERT SPD', WE WERE STRAIGHT AND LEVEL 10000 FT, 250 KTS AT THAT TIME. THEN AS WE WERE CLRED TO DSND TO 5000 FT, WE GOT A CLB RA ON TCASII. WE CLBED 300 FT (10300 FT MSL) BEFORE WE GOT A 'CLR OF CONFLICT' ON TCASII. WE ADVISED ATC, THEY SAID NO PROBLEM DSND TO 5000 FT. WE HAD VISUAL CONTACT WITH ONLY 1 OF 2 CONFLICTING ACFT. ONE WAS SAID BY ATC TO BE ACFT Y THAT HAD JUST RELEASED PARACHUTISTS AT 10500 FT JUST IN FRONT OF US. THIS IS THE ACFT WE SAW AT FLOWR INTXN DURING THE CONFLICT. HE WAS BELOW US (APPROX 1000-2000 FT) IN A 90 DEG BANK TURN WHEN SIGHTED. WE DID NOT SEE THE OTHER TFC. MY GREATEST CONCERN IS: WHY WAS AN ACFT PERMITTED TO DROP JUMPERS OVER FLOWR INTXN AT 10500 MSL? THIS ARR PLACED US OVER FLOWR AT 10000 FT AND 250 KTS.

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.