Phl controllers experience unique occurrence as stairs roll onto the runway after takeoff clearance ...

Attributes
ACN	647743
Time
Date	200502
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	agl single value : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : developmental
Experience	controller radar : 13
ASRS Report	647743
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : developmental
Experience	controller radar : 6
ASRS Report	647518
Events
Anomaly	conflict : ground critical ground encounters : vehicle incursion : runway
Independent Detector	atc equipment : conflict alert
Resolutory Action	controller : issued advisory controller : issued alert
Miss Distance	horizontal : 50
Supplementary
Problem Areas	Airport Company Maintenance Human Performance
Primary Problem	Ambiguous

Narrative:

I was working local west on a prm operation on feb/wed/05. After I scanned my runways; I cleared air carrier X for takeoff. As air carrier crossed runway 27R and taxiway east; a pair of stairs rolled onto the runway from the east ramp. The amass went off as air carrier X was past the stairs and taking off. I asked the pilot about the stairs. He said he did not see them. I immediately stopped departures; told the supervisor; and tried to get in touch with airport vehicles to secure the stairs.

Original NASA ASRS Text

Title: PHL CTLRS EXPERIENCE UNIQUE OCCURRENCE AS STAIRS ROLL ONTO THE RWY AFTER TKOF CLRNC IS ISSUED.

Narrative: I WAS WORKING LCL W ON A PRM OP ON FEB/WED/05. AFTER I SCANNED MY RWYS; I CLRED ACR X FOR TKOF. AS ACR CROSSED RWY 27R AND TXWY E; A PAIR OF STAIRS ROLLED ONTO THE RWY FROM THE E RAMP. THE AMASS WENT OFF AS ACR X WAS PAST THE STAIRS AND TAKING OFF. I ASKED THE PLT ABOUT THE STAIRS. HE SAID HE DID NOT SEE THEM. I IMMEDIATELY STOPPED DEPS; TOLD THE SUPVR; AND TRIED TO GET IN TOUCH WITH ARPT VEHICLES TO SECURE THE STAIRS.

Data retrieved from NASA's ASRS site as of January 2009 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.

Phl controllers experience unique occurrence as stairs roll onto the runway after takeoff clearance is issued.