<< >> NASA ASRS Report 119468, August 1989

Small aircraft X climbed through assigned altitude 3000' and conflicted with small transport Y at 4000'. Pilot deviation. Less than standard separation.

Attributes
ACN	119468
Time
Date	198908
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ekm
State Reference	IN
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sbn
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	119468
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Small aircraft X issued clearance to 3SY from ekm to maintain 3000' initial contact. 'Maintain 3000' restated and acknowledged. Small aircraft X later reported out of assigned altitude. Small transport Y was overhead at 4000', nwbnd for ILS approach at sbn. Pilot of small aircraft X instructed to maintain 3000'. Pilot left 3400' for assigned altitude. No action taken by small transport Y. I observed mode C reporting 3200'. Pilot advised in his climb at that time, less complexity and workload may have aided in catching situation sooner. However, difference would have only been about 100' earlier. Frequency congestion may have discouraged pilot from, again, verifying altitude assignment if unsure.

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Original NASA ASRS Text

Title: SMA X CLIMBED THROUGH ASSIGNED ALT 3000' AND CONFLICTED WITH SMT Y AT 4000'. PLT DEVIATION. LESS THAN STANDARD SEPARATION.

Narrative: SMA X ISSUED CLRNC TO 3SY FROM EKM TO MAINTAIN 3000' INITIAL CONTACT. 'MAINTAIN 3000' RESTATED AND ACKNOWLEDGED. SMA X LATER RPTED OUT OF ASSIGNED ALT. SMT Y WAS OVERHEAD AT 4000', NWBND FOR ILS APCH AT SBN. PLT OF SMA X INSTRUCTED TO MAINTAIN 3000'. PLT LEFT 3400' FOR ASSIGNED ALT. NO ACTION TAKEN BY SMT Y. I OBSERVED MODE C RPTING 3200'. PLT ADVISED IN HIS CLB AT THAT TIME, LESS COMPLEXITY AND WORKLOAD MAY HAVE AIDED IN CATCHING SITUATION SOONER. HOWEVER, DIFFERENCE WOULD HAVE ONLY BEEN ABOUT 100' EARLIER. FREQUENCY CONGESTION MAY HAVE DISCOURAGED PLT FROM, AGAIN, VERIFYING ALT ASSIGNMENT IF UNSURE.

Data retrieved from NASA's ASRS site as of August 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.