ZID ARTCC controller inadvertently assigned FL250 to climbing traffic with 2 arriving air carrier aircraft at FL250 resulting in a loss of separation.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	543794
Time
Date	200203
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : rod.vortac
State Reference	OH
Altitude	msl bound lower : 24000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : mizar
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 13 controller time certified in position1 : 1 controller time certified in position2 : 8
ASRS Report	543794
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	atc equipment : conflict alert atc equipment other atc equipment : radar other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action none taken : insufficient time
Miss Distance	horizontal : 12000 vertical : 700
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft X and aircraft Y both landing dtw on the mizar arrival north of dqn. Both aircraft at FL250. Aircraft Z climbing to FL240 under both aircraft X and aircraft Y. I went back to aircraft Z to issue the traffic and I inadvertently issued FL250 to aircraft Z. I noticed aircraft Z climbing above FL240 and told to maintain FL240. Pilot said 'roger, we will reverse our climb and go back down to FL240. I also had traffic at FL260 so I was trapped. Cause of error was my poor and improper phraseology on the traffic call and issuing the altitude of the traffic. I will now try and use 'a thousand above/below you.'

Original NASA ASRS Text

Title: ZID ARTCC CTLR INADVERTENTLY ASSIGNED FL250 TO CLBING TFC WITH 2 ARRIVING ACR ACFT AT FL250 RESULTING IN A LOSS OF SEPARATION.

Narrative: ACFT X AND ACFT Y BOTH LNDG DTW ON THE MIZAR ARR N OF DQN. BOTH ACFT AT FL250. ACFT Z CLBING TO FL240 UNDER BOTH ACFT X AND ACFT Y. I WENT BACK TO ACFT Z TO ISSUE THE TFC AND I INADVERTENTLY ISSUED FL250 TO ACFT Z. I NOTICED ACFT Z CLBING ABOVE FL240 AND TOLD TO MAINTAIN FL240. PLT SAID 'ROGER, WE WILL REVERSE OUR CLB AND GO BACK DOWN TO FL240. I ALSO HAD TFC AT FL260 SO I WAS TRAPPED. CAUSE OF ERROR WAS MY POOR AND IMPROPER PHRASEOLOGY ON THE TFC CALL AND ISSUING THE ALT OF THE TFC. I WILL NOW TRY AND USE 'A THOUSAND ABOVE/BELOW YOU.'

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.