2 incidents involving less than standard separation between aircraft on ILS approach. Multiple syste...

Attributes
ACN	130567
Time
Date	198912
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cak
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cak tower : cak tower : smf
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach descent other landing other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 10
ASRS Report	130567
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 5
ASRS Report	130564
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Intra Facility Coordination Failure
Situations
ATC Facility	other physical facility procedure or policy : unspecified

Narrative:

2 systems errors occurred at the cak approach control facility. Corp west and commuter X were never more than 1 1/2 mi apart, in trail on the ILS course at XA45Z. Small transport Y and air carrier Z were allowed to fly approximately 1 mi in trail for 4-5 mi on the ILS course at XB00Z. Nothing was done by the approach controllers to provide any type of separation. The controller laughed about it, and the supervisor did nothing after watching the situation. Supplemental information from acn 130564: I observed on the tower BRITE that air carrier Z was 2 1/2 mi in trail behind small transport Y, both on ILS runway 1. Air carrier X called me first, then small transport Y called. By this time the spacing was 2 mi. I broke the air carrier off the approach and handed him off back to the approach controllers. I feel by not having the ARTS iia, which has gndspd readout, we now have ARTS ii with no ground speed readout. ARTS iia keeps getting postponed.

Original NASA ASRS Text

Title: 2 INCIDENTS INVOLVING LESS THAN STANDARD SEPARATION BETWEEN ACFT ON ILS APCH. MULTIPLE SYSTEM ERRORS.

Narrative: 2 SYSTEMS ERRORS OCCURRED AT THE CAK APCH CTL FAC. CORP W AND COMMUTER X WERE NEVER MORE THAN 1 1/2 MI APART, IN TRAIL ON THE ILS COURSE AT XA45Z. SMT Y AND ACR Z WERE ALLOWED TO FLY APPROX 1 MI IN TRAIL FOR 4-5 MI ON THE ILS COURSE AT XB00Z. NOTHING WAS DONE BY THE APCH CTLRS TO PROVIDE ANY TYPE OF SEPARATION. THE CTLR LAUGHED ABOUT IT, AND THE SUPVR DID NOTHING AFTER WATCHING THE SITUATION. SUPPLEMENTAL INFO FROM ACN 130564: I OBSERVED ON THE TWR BRITE THAT ACR Z WAS 2 1/2 MI IN TRAIL BEHIND SMT Y, BOTH ON ILS RWY 1. ACR X CALLED ME FIRST, THEN SMT Y CALLED. BY THIS TIME THE SPACING WAS 2 MI. I BROKE THE ACR OFF THE APCH AND HANDED HIM OFF BACK TO THE APCH CTLRS. I FEEL BY NOT HAVING THE ARTS IIA, WHICH HAS GNDSPD READOUT, WE NOW HAVE ARTS II WITH NO GND SPD READOUT. ARTS IIA KEEPS GETTING POSTPONED.

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.

2 incidents involving less than standard separation between aircraft on ILS approach. Multiple system errors.