The wingtip of a BA31 struck another BA31's wingtip while the flight crew was departing the gate area. The marshaller continued to give the come ahead signal and did not see that the wing walker had signaled a problem until the wing walker ran ahead of the aircraft, signaling the flight crew to stop.

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Attributes
ACN	335642
Time
Date	199605
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iad
State Reference	VA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : okc
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 135
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Jetstream 31
Operating Under FAR Part	Part 135
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 248 flight time total : 7840 flight time type : 936
ASRS Report	335642
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : ground less severe
Independent Detector	other other : unspecified
Resolutory Action	none taken : insufficient time
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

During night taxi out of crowded parking ramp, right wingtip impacted left wingtip of adjacent parked aircraft. Taxi was under direction of a marshaller, assisted by a right wing walker. Wing walker did not walk along with aircraft movement and fell out of sight of the pilots, masked by the wing. First officer assumed we would clear the adjacent aircraft and shifted his attention to calling ground control for taxi clearance. Marshaller continued 'come ahead' hand signals until impact. Then wing walker came running into sight giving stop signal. Pilots shut down aircraft, escorted passenger off aircraft and back into the terminal. Damage was limited to wingtip fairings on each aircraft, which were replaced. The aircraft (both) returned to service in the morning. There were no injuries. Post- incident, the wing walker claimed to have signaled a stop to the marshaller before impact, but the marshaller did not see the signal.

Original NASA ASRS Text

Title: THE WINGTIP OF A BA31 STRUCK ANOTHER BA31'S WINGTIP WHILE THE FLC WAS DEPARTING THE GATE AREA. THE MARSHALLER CONTINUED TO GIVE THE COME AHEAD SIGNAL AND DID NOT SEE THAT THE WING WALKER HAD SIGNALED A PROB UNTIL THE WING WALKER RAN AHEAD OF THE ACFT, SIGNALING THE FLC TO STOP.

Narrative: DURING NIGHT TAXI OUT OF CROWDED PARKING RAMP, R WINGTIP IMPACTED L WINGTIP OF ADJACENT PARKED ACFT. TAXI WAS UNDER DIRECTION OF A MARSHALLER, ASSISTED BY A R WING WALKER. WING WALKER DID NOT WALK ALONG WITH ACFT MOVEMENT AND FELL OUT OF SIGHT OF THE PLTS, MASKED BY THE WING. FO ASSUMED WE WOULD CLR THE ADJACENT ACFT AND SHIFTED HIS ATTN TO CALLING GND CTL FOR TAXI CLRNC. MARSHALLER CONTINUED 'COME AHEAD' HAND SIGNALS UNTIL IMPACT. THEN WING WALKER CAME RUNNING INTO SIGHT GIVING STOP SIGNAL. PLTS SHUT DOWN ACFT, ESCORTED PAX OFF ACFT AND BACK INTO THE TERMINAL. DAMAGE WAS LIMITED TO WINGTIP FAIRINGS ON EACH ACFT, WHICH WERE REPLACED. THE ACFT (BOTH) RETURNED TO SVC IN THE MORNING. THERE WERE NO INJURIES. POST- INCIDENT, THE WING WALKER CLAIMED TO HAVE SIGNALED A STOP TO THE MARSHALLER BEFORE IMPACT, BUT THE MARSHALLER DID NOT SEE THE SIGNAL.

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.