<< >> NASA ASRS Report 501467, February 2001

Phl controller misses incorrect HS25 readback and it penetrates ZNY airspace and conflicts with en route DHC8.

Attributes
ACN	501467
Time
Date	200102
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : phl.tracon
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl.tracon
Operator	general aviation : corporate
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar controller : developmental
Experience	controller non radar : 2 controller radar : 12 controller supervisory : 1 controller time certified in position1 : 0.3
ASRS Report	501467
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	airspace violation : entry altitude deviation : overshoot conflict : airborne critical non adherence : required legal separation non adherence : clearance non adherence : published procedure
Independent Detector	atc equipment : conflict alert other controllera other flight crewa
Resolutory Action	controller : issued new clearance controller : issued advisory
Consequence	faa : investigated
Miss Distance	horizontal : 5000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Operational Deviation Inter Facility Coordination Failure

Narrative:

I was working the south departure/dupont sector at phl approach control. I released the HS25 from ilg. When I was contacted by the aircraft I radar idented it, issued a vector on course, and climbed the aft to 10000 ft. My exact phraseology was 'climb and maintain one-zero, ten thousand.' the pilot read back 'one-two thousand.' I did not catch the readback error. A few moments later, I observed the aircraft climbing through 11000 ft. I stated to the pilot that I had assigned an altitude of 10000 ft. I then issued an immediate descent clearance to 10000 ft and traffic to the HS25 that was 12 O'clock and 2 mi at 12000 ft. The pilot of the HS25 stated they had the traffic in sight and I issued instructions to maintain visual separation. I then effected coordination with ZNY and had control jurisdiction for the other aircraft. I feel increased pilot vigilance could have prevented this situation. I did not anticipate an incorrect readback, especially after I had reiterated the altitude.

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Original NASA ASRS Text

Title: PHL CTLR MISSES INCORRECT HS25 READBACK AND IT PENETRATES ZNY AIRSPACE AND CONFLICTS WITH ENRTE DHC8.

Narrative: I WAS WORKING THE S DEP/DUPONT SECTOR AT PHL APCH CTL. I RELEASED THE HS25 FROM ILG. WHEN I WAS CONTACTED BY THE ACFT I RADAR IDENTED IT, ISSUED A VECTOR ON COURSE, AND CLBED THE AFT TO 10000 FT. MY EXACT PHRASEOLOGY WAS 'CLB AND MAINTAIN ONE-ZERO, TEN THOUSAND.' THE PLT READ BACK 'ONE-TWO THOUSAND.' I DID NOT CATCH THE READBACK ERROR. A FEW MOMENTS LATER, I OBSERVED THE ACFT CLBING THROUGH 11000 FT. I STATED TO THE PLT THAT I HAD ASSIGNED AN ALT OF 10000 FT. I THEN ISSUED AN IMMEDIATE DSCNT CLRNC TO 10000 FT AND TFC TO THE HS25 THAT WAS 12 O'CLOCK AND 2 MI AT 12000 FT. THE PLT OF THE HS25 STATED THEY HAD THE TFC IN SIGHT AND I ISSUED INSTRUCTIONS TO MAINTAIN VISUAL SEPARATION. I THEN EFFECTED COORD WITH ZNY AND HAD CTL JURISDICTION FOR THE OTHER ACFT. I FEEL INCREASED PLT VIGILANCE COULD HAVE PREVENTED THIS SIT. I DID NOT ANTICIPATE AN INCORRECT READBACK, ESPECIALLY AFTER I HAD REITERATED THE ALT.

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.