SPOP 425 - Requirements after Contact with Fire Extinguishing Agents, Hydraulic Fluid, Fuel or Oil [PW11]

TASK 70-27-00-910-806-A
SPOP 425 - Requirements after Contact with Fire Extinguishing Agents, Hydraulic Fluid, Fuel or Oil

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P11-049)	aqueous cleaner

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-801-A	SPOP 1 - Degreasing of the Engine Exterior
TASK 70-27-00-910-804-A	SPOP 208 - Degreasing of Parts by Solvent Wiping
TASK 70-70-00-910-803-A	SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses
Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel

3. Job Set-up
Subtask 70-27-00-869-050-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 70-27-00-280-050-A ** ON A/C NOT FOR ALL

WARNING: REFER TO THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIAL INFORMATION. THIS INCLUDES HAZARDOUS INGREDIENTS, PHYSICAL AND CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, AND USE OF CONTROL MEASURES.

A. General Instructions

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

NOTE: Always obey the specific procedures and limits in the specific AMM maintenance tasks.

(1) SPOP 425 gives the operators the cleaning and disassembly requirements for engines that come in contact with (touch) fire extinguisher agents during a fire in the burner (combustor) and/or gaspath areas of the engine, or that come in contact with hydraulic fluid, oils or fuel. Contact (speak or write to) the local Pratt & Whitney representative for the applicable requirements and procedures when the subsequent conditions occur:
(a) The engine comes in contact with a fire extinguisher agent when there is no fire (for example, during accidental operation of the fire extinguisher system).
(b) The fire temperature was higher than the engine over-temperature limits.
(c) The fire occurred in areas other than the burner and gaspath areas of the engine.
(2) After a fire extinguisher agent goes into the engine, do not operate the engine if the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

shows that the fire extinguisher agent makes it necessary to disassemble the engine. Some fire extinguisher agents can cause damage to engine parts at engine operation temperatures.
(3) If you used carbon dioxide, nitrogen, Ansul Inergen, water or water fog to extinguish a tail pipe fire and the post-fire inspection finds no fire damage or mechanical damage, then it will not be necessary to disassemble the engine to clean the engine parts.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

For many other fire extinguisher agents, it is necessary to disassemble the engine to satisfactorily clean the parts that come in contact with the fire extinguisher agent.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

(4) Before you do maintenance work on a hangar fire extinguisher system that uses foam, remove engines from the hangar or put covers on the engines to make sure that accidental operation of the system does not cause foam to go into the engine.
(5) The necessary detailed procedures for gaspath cleaning (internal wash) and instructions for subsequent disassembly, cleaning and inspection are in the applicable AMM maintenance tasks.
(6) If the operators know of airports, test cells or hangars that use fire extinguisher agents that are not in the list in the figure,

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

then they must give instructions to their local Pratt & Whitney representative to send the Technical Data Sheets and Material Safety Data Sheets for these fire extinguisher agents to Pratt & Whitney Customer Service in East Hartford, Connecticut.
(7) The primary concern, when foam or dry chemical fire extinguisher agents go into an engine, it can cause corrosion during subsequent engine operation. The engine operation environment can cause chemical reactions of the fire extinguisher agents, which then can cause corrosion on cold-section and/or hot-section parts.
(8) Tests show these results:
(a) Stainless steel alloys, nickel-base alloys (coated or uncoated) and cobalt-base alloys, show a high risk of chemical corrosion from some types of fire extinguisher agents (for example, protein foams and dry chemical agents), at temperatures much lower than the engine operation range.
(b) Titanium, aluminum, magnesium, cadmium-plated and nickel-cadmium plated low-alloy steels show no signs of corrosion from bicarbonate compounds (dry powders) at engine operation temperatures.
(c) Many of the foam fire extinguisher agents in the list in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

cause stress corrosion cracks in titanium at the service operation temperatures in the high pressure compressor, but not at the service operation temperatures of the fan. Thus, it is permitted to hand-wipe clean with aqueous cleaner (Material No.P11-049) to remove overspray of foam fire extinguisher agents from fan blades.
(d) Some of the Aqueous Film-Forming Foam (AFFF) and high-expansion foam chemical fire extinguisher agents in the list in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

do not cause corrosion on engine material test panels at engine operation temperatures. The figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

shows which AFFF and high-expansion foam agents have test results that show they are compatible with engine alloys and coatings. For other AFFF and high-expansion foam agents, it is necessary to disassemble the engine to remove the parts that came in contact with the foam.
(9) Halon 1301 fire extinguisher agent decomposes in fires and at engine operation temperatures to make acids that can cause corrosion of or stress corrosion cracks in gaspath materials at high temperatures. Tests show that Halon 1301 can degrade turbine airfoil coatings at 1800 deg.F (982.22 deg.C) in a short period of time.
(a) Fire extinguisher systems that release Halon 1301 directly into the core of the engine (for example, ground units) can cause the turbofan airfoils to come in contact with Halon 1301.
(b) Onboard nacelle Halon 1301 fire extinguisher systems usually do not cause the turbine airfoils to come in contact with Halon 1301 because these systems release Halon 1301 into the nacelle compartment and not directly into the engine core. Thus, it is usually not necessary to clean engine gaspath parts to remove Halon 1301 decomposition materials after an onboard nacelle fire extinguisher system releases Halon 1301.
(10) The AFFF in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

are NFPA Class-B foam fire extinguisher agents that use synthetic surfactants, which are usually fluorinated. These foams do not contain protein foaming agents.
(11) The high-expansion foams in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

are NFPA Class-B foam fire extinguisher agents that expand quickly to fill closed spaces (for example, hangars). These foams usually use synthetic surfactants that are different from the synthetic surfactants in the AFFF.
(12) The protein (P), fluoroprotein (FP), and film-forming fluoroprotein (FFFP) foams in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

are NFPA Class-B foam fire extinguisher agents that use protein foaming agents.

Subtask 70-27-00-110-052-A ** ON A/C NOT FOR ALL

B. Cleaning after Chemical Contact with Fire Extinguisher Agents
(1) After a fire or after you use an onboard nacelle fire extinguisher system because of a cockpit fire warning, do an inspection of the engine for fire damage:
(a) Turn the rotor manually to do a check to make sure that the rotor turns freely:
1 The rotor must turn freely. A rotor that does not turn freely is a sign of damage.
2 While the rotor turns, listen for parts that rub against or hit other parts that they usually do not touch. Such noises are signs of damage.
(b) Do a visual inspection of the external surfaces of the engine to look for fire damage.
(c) Do a borescope inspection of the engine to see which parts have fire damage.
(d) If the check for free movement finds one or more signs of damage, the visual inspection finds fire damage, and/or the borescope inspection finds fire damage, then it is necessary to remove the engine from the airframe and disassemble the engine to remove the parts that have damage.
(2) In engine models that use labyrinth seals, do a check for contamination of the oil systems because the materials in the list in the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

could enter the oil system through the labyrinth seals.
(3) See the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

for the inspection, cleaning and disassembly requirements for engines that come in contact with fire extinguisher agents during a fire. The procedures for the requirement in each column of the figure

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

are in the subsequent list:
(a) Visual/Borescope inspection, column 2:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

1 If column 2 says "YES" for the material, then do the subsequent procedure:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

a Do a visual inspection of the external surfaces of the engine to see which parts have contamination from the material.
b Do an internal borescope inspection to see which parts have contamination from the material.

NOTE: This inspection will show how much of the engine you must disassemble to remove the parts that have contamination from the material.

NOTE: This inspection does not show contamination from gaseous fire extinguisher agents or vaporizing liquid fire extinguisher agents.

2 If column 2 says "N/R" for the material, then it is not required (that is, it is permitted, but not necessary) to do a borescope inspection of the engine to look for contamination.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

(b) External wash, column 3:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

1 If column 3 says "YES" for the material, then do an external wash to remove the material from the external surfaces of the engine that had chemical contact with the material. Use this procedure:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

a Use Cleaning of Electrical Harnesses and Contact Points (SPOP 6) to clean electrical harnesses and contact points (Ref. AMM TASK 70-70-00-910-803).
b Use Cleaning the Exterior of the Engine (SPOP 1) to clean other external surfaces (Ref. AMM TASK 70-27-00-910-801).
2 If column 3 says "NO" for the material, then do not do an external wash.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

3 If column 3 says "N/R" for the material, then it is not required (that is, it is permitted, but not necessary) to do an external wash to remove the material from the external surfaces.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

CAUTION: IF YOU OPERATE THE ENGINE AFTER ENGINE GASPATH PARTS COME IN CONTACT WITH THE MATERIAL, THE MATERIAL COULD CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.

1 If column 4 says "YES" for the material, then do an internal (gaspath) wash of the engine to remove the material from the engine gaspath surfaces. Refer to the applicable AMM maintenance task for the gaspath wash procedures.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

2 Internal wash not permitted
a If column 4 says "NO" for the material, then it is not permitted to do an internal (gaspath) wash. Do not operate the engine after engine gaspath parts come in contact with the material.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

b If you or some other operator does an internal wash after engine gaspath parts come in contact with the material, then it will be necessary to remove and clean all the parts in the engine gaspath.

NOTE: It is not possible to fully remove foam fire extinguisher agents from the engine gaspath by internal wash (with plain water or with detergent).

NOTE: Dry chemical fire extinguisher agents are not water soluble. Thus, an internal wash will cause these materials to cake, bond to engine parts and/or cause air holes and cavities to become clogged.

3 If column 4 says "N/R" for the material, then it is not required (that is, it is permitted, but not necessary) to do an internal (gaspath) wash to remove the material from engine gaspath surfaces.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

(d) Disassemble/Clean by engine manual, column 5:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

CAUTION: IF YOU OPERATE THE ENGINE AFTER ENGINE GASPATH PARTS COME IN CONTACT WITH THE MATERIAL, THE MATERIAL COULD CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.

1 If column 5 says "YES" for the material, then disassemble the engine to clean the parts that have contamination. Use the subsequent procedure:

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

a Do not operate the engine after the engine has chemical contact with the material.
b Complete this procedure as soon as possible after the parts have chemical contact with the material.
c For gaseous fire extinguisher agents or vaporizing liquid fire extinguisher agents, disassemble the engine to remove all the parts in the engine gaspath.
d For foam fire extinguisher agents or dry chemical fire extinguisher agents, disassemble the engine to remove those parts on which the visual/boroscope inspection found contamination.

If you or some other operator did a gaspath wash after the material went into the engine, then it is necessary to remove and clean all the parts in the engine gaspath.

e Use the applicable AMM maintenance task for instructions to clean the parts.
f After the parts are clean, do a visual inspection of all the parts that had chemical contact. Use the applicable AMM maintenance task for inspection limits.
2 If column 5 says "N/R" for the material, then it is not required (that is, it is permitted, but not necessary) to disassemble the engine to clean the parts.

Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil Or Fuel ** ON A/C NOT FOR ALL

Subtask 70-27-00-110-053-A ** ON A/C NOT FOR ALL

C. Cleaning after a Hydraulic Fluid Leak
(1) After a hydraulic fluid leak, do the subsequent procedure:
(a) Do not operate the engine after the engine has chemical contact with the material.
(b) Do a visual inspection of the external surfaces of the engine to see which parts have contamination from hydraulic fluid.
1 If external surfaces show baked-on or burned hydraulic fluid, contact the local Pratt & Whitney representative for the applicable requirements and procedures.
2 If external surfaces show wet hydraulic fluid with no indication of baked-on or burned hydraulic fluid, then do the subsequent steps in this procedure.
(c) If the visual inspection of the external surfaces of the engine finds indications that hydraulic fluid went into the engine through bleed valves, the inlet or the exhaust, then do an internal borescope inspection to see which parts have contamination from the hydraulic fluid.

NOTE: This inspection will show how much of the engine you must disassemble to remove the parts that have contamination from the hydraulic fluid.

1 If gaspath surfaces show contamination from hydraulic fluid, then it is necessary to remove the parts that have contamination from the hydraulic fluid for better cleaning.
2 It is not permitted to do an internal wash to remove hydraulic fluid from the gaspath surfaces.
(d) If the visual inspection of the external surfaces of the engine found wet hydraulic fluid with no indication of baked-on or burned hydraulic fluid, then do an external wash to remove the hydraulic fluid from the external surfaces of the engine. Use the subsequent procedure.
1 Use Cleaning of Electrical Harnesses and Contact Points (SPOP 6) to clean the electrical harnesses and contact points (Ref. AMM TASK 70-70-00-910-803).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Use Cleaning the Exterior of the Engine (SPOP 1) to clean other external surfaces (Ref. AMM TASK 70-27-00-910-801).
b Use Degrease Engine Parts by Solvent Wipe (SPOP 208) to remove grease from other external surfaces (Ref. AMM TASK 70-27-00-910-804).
3 After the above steps, do a visual inspection to look for remaining hydraulic fluid varnish or baked-on hydraulic fluid.
(e) If the visual inspection after the external wash finds remaining hydraulic fluid varnish or baked-on hydraulic fluid, then do the subsequent procedure:
1 Disassemble the engine to remove those parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
2 Use the applicable AMM maintenance task instructions to clean the parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
3 After the parts are clean, do a visual inspection of the parts. Use the applicable AMM maintenance task for the inspection limits.
(f) If inspection finds part surfaces with baked-on or burned hydraulic fluid and/or engine gaspath surfaces with contamination from hydraulic fluid, then do the subsequent procedure:
1 Do not operate the engine if engine gaspath surfaces have contamination from hydraulic fluid.
2 Disassemble the engine to remove those gaspath parts on which the visual/borescope inspection found contamination from hydraulic fluid.
a If you or some other operator did a gaspath wash after the contamination of the engine gaspath surfaces from hydraulic fluid occurred, then it is necessary to remove and clean all the parts in the engine gaspath.
3 Use the applicable AMM maintenance task instructions to clean the parts.
4 After the parts are clean, do a visual inspection of all the parts that had contamination from hydraulic fluid. Use the applicable AMM maintenance task for the inspection limits.

Subtask 70-27-00-110-054-A ** ON A/C NOT FOR ALL

D. Cleaning after an Oil or Fuel Leak
(1) After an oil or fuel leak, do the subsequent procedure:
(a) Do an external wash to remove the oil or fuel from the external surfaces of the engine. Do the subsequent steps:
1 Use Cleaning of Electrical Harnesses and Contact Points (SPOP 6) to clean the electrical harnesses and contact points (Ref. AMM TASK 70-70-00-910-803).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Use Cleaning the Exterior of the Engine (SPOP 1) to clean other external surfaces (Ref. AMM TASK 70-27-00-910-801).
b Use Degrease Engine Parts by Solvent Wipe (SPOP 208) to remove grease from other external surfaces (Ref. AMM TASK 70-27-00-910-804).
(b) Do an internal (gaspath) wash of the engine to remove the oil or fuel from the engine gaspath surfaces. Refer to the applicable AMM maintenance task for the gaspath wash procedure.

[Rev.10 from 2021] 2026.04.01 02:20:29 UTC