-2 chapter 9 Flashcards
Under emergency conditions, all personnel shall
assume responsibility for minimizing damage. Removal
of equipment shall be supervised by
Maintenance Officer (MO)
AIRCRAFT FIREFIGHTING.
Firefighting in and around crashed aircraft is highly specialized.
Refer to NAVAIR 00‑80R‑14 (NATOPS U.S. Navy
Aircraft Firefighting and Rescue Manual) for approved
fire extinguishing agents, methods of application, and firefighting equipment
aircraft component groups
arranged in order of recommended priority for treatment.
Among the factors to be considered when removing
equipment are:
dollar value, corrosion rate, availability of
replacement parts, and probability of successful salvage.
For cases involving aircraft accidents, permission
for any treatment shall be obtained from
the senior
member of the accident investigation board prior to
initiating procedures for emergency reclamation. Failure
to obtain permission jeopardizes the ability of the
accident investigation team to determine the cause of
the incident.
Who shall determine which
extinguishing agent was used on the aircraft
the fire deptarment
The mechanical cutting of fuel, hydraulic and
oil lines, electrical leads, and other drastic operations
necessary to expedite removal of components are at
the discretion of
the MO
Purple K Dry Chemical Powder.
The principal
base chemical for Purple-K-Powder (PKP) is potassium
bicarbonate. Since it is a purple powder, the PKP fire
extinguishers are marked with a purple band around
the tank. PKP is primarily used to extinguish flammable
liquid and gas fires such as gasoline, greases, oils, and
paints.
Removing Purple K Powder (PKP) and Other
Dry Chemical Fire Extinguishing Agents.
a. Vacuum cleaning.
b. Use a soft bristle brush and air pressure not
greater than 10 psi to dislodge contaminants between
close‑fitting components.
c. Vacuum clean again.
d. Remove the residual film of dry powder adhering
to the surface by wiping, brushing, or spraying with
a solution of one part aircraft cleaning compound
(MIL‑PRF‑85570 Type II) in 14parts of water.
e. Rinse thoroughly with fresh water.
f. Dry with cloths or paper towels, or blow dry with
air pressure not greater than 10 psi.
g. Liberally apply water displacing CPC
(MIL‑PRF‑81309 Type II) to affected areas.
h. Enter location of affected areas and list components
that were exposed to PKP fire extinguishing agent in the
appropriate section of the aircraft logbook, corrosion
folder, or other appropriate documents to ensure that the area is re-inspected in the future as a corrosion prone
area.
A Q U E O U S F I L M - F O R M I N G F O A M
MIL-F-24385
AFFF is
a specially formulated synthetic concentrate made from
surfactants, solvents, and additives. When mixed with
either fresh or salt water, it will form a dense foam over
the liquid fuel to rapidly smother and cool hydrocarbon
fuel fires such as gasoline, kerosene, and diesel.
Removing Aqueous Film Forming Foam
AFFF
a. Flush all affected areas with clean, fresh water
while draining. Whenever possible, units or components
which have been removed should be immersed in fresh
water and then flushed thoroughly with fresh, clean
water. Drain away the water.
b. Mix a solution of one pint of AFFF fire extinguishing
agent in 10 gallons of fresh water.
following methods:
(1) Use any type of spray equipment such as a
foam generator, solvent wash gun, or back pack.
(2) Use an applicator such as aircraft washing
pads, sponges, or low lint cloths, or pour AFFF solution
directly over affected areas if foaming equipment is not
available.
d. Keep affected areas wet with AFFF solution for 3
to 5 minutes.
e. Clean surfaces with a solution of one part aircraft
cleaning compound (MIL‑PRF‑85570 Type II) in 14parts
of water. Scrub affected areas and rinse with clean, fresh
water. Drain away excess water.
f. Dry with cloths, paper towels, or air pressure not
greater than 10 psi.
g. Apply water displacing preservative
(MIL‑PRF‑81309 Type III) to all avionic components and
electrical connectors. Liberally apply water displacing
CPC (MIL‑PRF‑81309 Type II) to all other areas that
cannot be properly drained or have recesses which are
difficult to reach.
h. Enter location of affected areas and list components
that were exposed to AFFF fire extinguishing agent in
the appropriate section of the aircraft logbook, corrosion
folder, or other appropriate documents to ensure that the area is re-inspected in the future as a corrosion prone
Carbon Dioxide (CO2).
Carbon dioxide is a
dry, non-corrosive, inert gas that is used on flammable
liquids and electrical fires because it does not leave
any residues which might further harm the damaged
electrical equipment. Also, CO2 is ideal for use on
fires when it is important to avoid water damage. CO2
works by reducing the amount of oxygen available for
combustion by smothering it. Although CO2 is nonpoisonous, asphyxiation can result from breathing it
and supplied air must be worn when CO2 is used below
decks or in confined spaces.
Halon 1211 (Bromochlorodifluoromethane)
Halons are colorless, odorless gases. They extinguish
most types of fires without leaving a residue and may
be discharged in confined spaces if suitable breathing
apparatus is worn. Typically, Halon 1211 is used in
areas that contain sensitive or irreplaceable equipment
that could be damaged or destroyed by water, foam,
dry chemical, or carbon dioxide. Like PKP, Halon 1211
does not extinguish by smothering or cooling, instead
it interrupts the chemical reaction of the fire as it
decomposes upon contact. Halons have been found to
be an ozone depleting agent; however, some Halons
are still required for aircraft and shipboard applications
as no safe and effective alternative exists. Halon 1211
extinguishers are marked with a reflective silver band
around the tank.
Removing CO2 and Halon 1211
CO2 and Halon 1211 evaporate rapidly.
Therefore, no cleanup is required unless moisture or
high temperature was present at the area of application.
However, ventilation shall always be provided to remove
the vapors. If moisture or high temperature was present,
use the following clean‑up procedures.
a. After fire has been extinguished, purge area
and surface with clean, dry air (dust free, low moisture
content, compressed air).
b. Clean surfaces with a solution of one part aircraft
cleaning compound (MIL‑PRF‑85570 Type II) in 14parts
of water. Scrub affected areas and rinse with clean, fresh
water. Drain away excess water.
c. Dry with cloths, paper towels, or air pressure not
greater than 10 psi.
d. Apply water displacing preservative
(MIL‑PRF‑81309 Type III) to all avionic components and
electrical connectors. Liberally apply water displacing
CPC (MIL‑PRF‑81309 Type II) to all other areas that
cannot be properly drained or have recesses which are
difficult to reach.
e. Enter location of affected areas and list
components that were exposed to fire extinguishing
agent in the appropriate section of the aircraft logbook,
corrosion folder, or other appropriate documents to
ensure that the area is re-inspected in the future as a
corrosion prone area.
