Controller was expecting a departure aircraft to climb above an en route air carrier, but climb rate slowed down resulting in less than standard separation.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	200834
Time
Date	199202
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pit
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other enroute airway : zob
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 4 controller radar : 11
ASRS Report	200834
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 27600 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X en route pit was descending to 9000 approximately 45 mi southeast of pit. Cga Y had departed westmoreland county airport on a 200 degree heading climbing initially to 8000. I received the handoff and the aircraft checked on frequency. I then issued cga Y a 245 degree heading direct hvc and climb to FL230. As cga Y turned, his ground speed dropped off and separation began to decrease. I then told cga Y to expedite his climb through 11000 and he acknowledged. Separation was lost approximately 15 seconds later. Neither aircraft saw each other and no evasive action was taken.

Original NASA ASRS Text

Title: CTLR WAS EXPECTING A DEP ACFT TO CLB ABOVE AN ENRTE ACR, BUT CLB RATE SLOWED DOWN RESULTING IN LTSS.

Narrative: ACR X ENRTE PIT WAS DSNDING TO 9000 APPROX 45 MI SE OF PIT. CGA Y HAD DEPARTED WESTMORELAND COUNTY ARPT ON A 200 DEG HDG CLBING INITIALLY TO 8000. I RECEIVED THE HDOF AND THE ACFT CHKED ON FREQ. I THEN ISSUED CGA Y A 245 DEG HDG DIRECT HVC AND CLB TO FL230. AS CGA Y TURNED, HIS GND SPD DROPPED OFF AND SEPARATION BEGAN TO DECREASE. I THEN TOLD CGA Y TO EXPEDITE HIS CLB THROUGH 11000 AND HE ACKNOWLEDGED. SEPARATION WAS LOST APPROX 15 SECONDS LATER. NEITHER ACFT SAW EACH OTHER AND NO EVASIVE ACTION WAS TAKEN.

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.