Controller training in progress and small aircraft lands on occupied runway.

Attributes
ACN	164340
Time
Date	199012
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ful
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi landing other
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent other landing other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
ASRS Report	164340
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : developmental
Events
Anomaly	conflict : ground critical non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : insufficient time none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 2000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small aircraft X landed on runway 24 and rolling out to intersection #5. Small aircraft Y on final approach just crossing the end of runway 24 prior to the displaced threshold, still airborne. I was overseeing a developmental controller who was talking to other aircraft on the radio. When I observed the situation on the runway I immediately attempted to override the developmental's transmission so as to tell the small aircraft Y to go around. After 2 attempts I discovered the override function to be inoperative and instructed the developmental to tell the small aircraft Y to go around. By the time he finished the instructions to the small aircraft Y it had landed. If the radio override capability was operational, I would have had the opportunity to tell the small aircraft Y to go around. A matter of days before this incident it is my understanding that FAA af personnel were working on this radio position due to an unrelated problem. To the best of my knowledge, the function worked prior to his repair work.

Original NASA ASRS Text

Title: CTLR TRAINING IN PROGRESS AND SMA LANDS ON OCCUPIED RWY.

Narrative: SMA X LANDED ON RWY 24 AND ROLLING OUT TO INTXN #5. SMA Y ON FINAL APCH JUST XING THE END OF RWY 24 PRIOR TO THE DISPLACED THRESHOLD, STILL AIRBORNE. I WAS OVERSEEING A DEVELOPMENTAL CTLR WHO WAS TALKING TO OTHER ACFT ON THE RADIO. WHEN I OBSERVED THE SITUATION ON THE RWY I IMMEDIATELY ATTEMPTED TO OVERRIDE THE DEVELOPMENTAL'S XMISSION SO AS TO TELL THE SMA Y TO GO AROUND. AFTER 2 ATTEMPTS I DISCOVERED THE OVERRIDE FUNCTION TO BE INOP AND INSTRUCTED THE DEVELOPMENTAL TO TELL THE SMA Y TO GO AROUND. BY THE TIME HE FINISHED THE INSTRUCTIONS TO THE SMA Y IT HAD LANDED. IF THE RADIO OVERRIDE CAPABILITY WAS OPERATIONAL, I WOULD HAVE HAD THE OPPORTUNITY TO TELL THE SMA Y TO GO AROUND. A MATTER OF DAYS BEFORE THIS INCIDENT IT IS MY UNDERSTANDING THAT FAA AF PERSONNEL WERE WORKING ON THIS RADIO POS DUE TO AN UNRELATED PROB. TO THE BEST OF MY KNOWLEDGE, THE FUNCTION WORKED PRIOR TO HIS REPAIR WORK.

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.