777 foam cannon goes wrong
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sorry!
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These things happen...
**** 08/23/1999 Preliminary Accident/Incident Data Record RECORD 2 ****
A. Type: Incident Mid Air:N Missing:N Entry date: 08/23/1999
From: ATLANTA, GA, ATCT
B. Reg.No.: DAL11 M/M: B777 Desc: BOEING B-777
Activity: Business Phase: Taxi GA-A/C: Air Carrier
Descr: DELTA AIRLINES ACFT WAS TAXIING TO THE RAMP AND WAS BEING SPRAYED BY A FIRE TRUCK AS IT WAS THE CAPTAIN'S LAST FLIGHT WHEN THE ACFT RIGHT WING STRUCK THE BOOM ON THE FIRE TRUCK, THE ACFT SUSTAINED MINOR DAMAGE TO THE LEADING EDGE SLAT, NO INJURIES WERE REPORTED, ATLANTA, GA.
WX: METAR KATL 211753Z 23007KT 10SM CLR 31/14 A3000
Damage: Minor
C2. Injury Data: # Crew: 0 Fat: 0 Ser: 0 Min: 0 Unk:Y# Pass: 0 Fat: 0 Ser: 0 Min: 0
Unk:Y
# Grnd: Fat: 0 Ser: 0 Min: 0 UNK:
D. Location City: ATLANTA State: GA
E. Occ Date: 08/21/1999 Time: 18:00
F. Invest Coverage. IIC: Reg/DO: SO11 DO CTY: ATLANTADO State: GA
Others:
G. Flt Handling. Dep Pt: UNKN Dep Date: / / Time:
Dest: ATLANTA, GA Last Radio Cont: UNKN Flt Plan: IFR
Last Clearance: UNKN WX Briefing: Other:
**** 08/23/1999 Preliminary Accident/Incident Data Record RECORD 2 ****
A. Type: Incident Mid Air:N Missing:N Entry date: 08/23/1999
From: ATLANTA, GA, ATCT
B. Reg.No.: DAL11 M/M: B777 Desc: BOEING B-777
Activity: Business Phase: Taxi GA-A/C: Air Carrier
Descr: DELTA AIRLINES ACFT WAS TAXIING TO THE RAMP AND WAS BEING SPRAYED BY A FIRE TRUCK AS IT WAS THE CAPTAIN'S LAST FLIGHT WHEN THE ACFT RIGHT WING STRUCK THE BOOM ON THE FIRE TRUCK, THE ACFT SUSTAINED MINOR DAMAGE TO THE LEADING EDGE SLAT, NO INJURIES WERE REPORTED, ATLANTA, GA.
WX: METAR KATL 211753Z 23007KT 10SM CLR 31/14 A3000
Damage: Minor
C2. Injury Data: # Crew: 0 Fat: 0 Ser: 0 Min: 0 Unk:Y# Pass: 0 Fat: 0 Ser: 0 Min: 0
Unk:Y
# Grnd: Fat: 0 Ser: 0 Min: 0 UNK:
D. Location City: ATLANTA State: GA
E. Occ Date: 08/21/1999 Time: 18:00
F. Invest Coverage. IIC: Reg/DO: SO11 DO CTY: ATLANTADO State: GA
Others:
G. Flt Handling. Dep Pt: UNKN Dep Date: / / Time:
Dest: ATLANTA, GA Last Radio Cont: UNKN Flt Plan: IFR
Last Clearance: UNKN WX Briefing: Other:
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Below the Glidepath - not correcting
Saw some SouthWest guy get the treatment at PHX Thursday, and couldn't help thinking what that volume of water down the intake was doing, never mind using foam (although that's more about corrosive properties than shock loading). I know rain flow gets heavy, but nothing like that from the end of a high pressure hose, "mechanical sympathy" is the phrase that springs to mind.
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.......From a note from SFO MOC Engineering: 2372 came in and the fire department trucks were giving the final salute. The truck on the right side sprayed fire extinguishing agent (foam) rather than water. IAD wanted to clean it and go. SAMC called the MOC who put a stop on that action. Foam
is very corrosive on hot titanium parts (primarily in the HPC section
of the gaspath. SFOEP had the engines borescoped and both showed evidence
of foam ingestion (both engines were running at idle when this occurred).
The airplane is OTS in IAD and the engines will be removed. The MOC
doesn't have any spare 777 engines so they are using previously removed
engines as mules to fly the airplane from IAD to SFO for storage until
they can produce more engines. The airplane will be OTS for the near
future - just before the major holiday traffic period!
Generally speaking almost all the fire extinguishing agents are corrosive
on hot engine parts so if that happens it is an engine removal. However,
P&W has never tested this particular foam so the MOC is getting a sample
of the foam for P&W to test.
