Reporter descended air carrier #1 from FL270 to FL180 with air carrier #2 at FL260. Air carrier #1 received TCASII RA at FL265 and climbed back up. Operational error.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	362771
Time
Date	199703
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : psb
State Reference	PA
Altitude	msl bound lower : 26500 msl bound upper : 26500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 3 controller non radar : 1 controller radar : 6
ASRS Report	362771
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #1 cruising FL270 2 mi north psb VOR sbound. Aircraft #2 cruising FL260 5 mi east psb VOR wbound. I issued descent to aircraft #1 to descend to FL180, not realizing conflict. Aircraft #1 began descent. At FL265 he advised TCASII RA climbing back up. My actions caused error due to my lack of vigilance. TCASII saved a more serious situation.

Original NASA ASRS Text

Title: RPTR DSNDED ACR #1 FROM FL270 TO FL180 WITH ACR #2 AT FL260. ACR #1 RECEIVED TCASII RA AT FL265 AND CLBED BACK UP. OPERROR.

Narrative: ACFT #1 CRUISING FL270 2 MI N PSB VOR SBOUND. ACFT #2 CRUISING FL260 5 MI E PSB VOR WBOUND. I ISSUED DSCNT TO ACFT #1 TO DSND TO FL180, NOT REALIZING CONFLICT. ACFT #1 BEGAN DSCNT. AT FL265 HE ADVISED TCASII RA CLBING BACK UP. MY ACTIONS CAUSED ERROR DUE TO MY LACK OF VIGILANCE. TCASII SAVED A MORE SERIOUS SIT.

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.