DOC AIRBUS | AMM A320FCleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil or Fuel [IAE]
TASK 70-11-56-910-001-A
Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil or Fuel
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials
B. Referenced Information
3. Job Set-up
Subtask 70-11-56-869-050-A ** ON A/C NOT FOR ALL
Subtask 70-11-56-910-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:19:30 UTC
Cleaning Requirements after Chemical Contact with Fire Extinguisher Agents, Hydraulic Fluid, Oil or Fuel
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-459) | aqueous wipe cleaner |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-11-50-100-010-A | Remove Grease from the External Surfaces of the Engine |
| TASK 70-11-50-100-020-A | Cleaning of Contact Points and Wiring Harnesses |
| TASK 72-00-00-100-010-A | Clean the Engine Gas Path for Performance Improvement (Water only) |
| TASK 72-00-00-100-010-A-01 | Clean the Engine Gas Path for Performance Improvement (Cleaner only) |
| TASK 72-00-00-100-010-A-02 | Clean the Engine Gas Path for Performance Improvement (Water only) Repair VRS7003 |
Cleaning Requirements after Chemical Contact with Fire Extinguisher AgentsSubtask 70-11-56-869-050-A ** ON A/C NOT FOR ALL
A. Safety Precautions
4. ProcedureSubtask 70-11-56-910-050-A ** ON A/C NOT FOR ALL
A. General
(1) This task provides operators with information related to the determination of appropriate cleaning and disassembly requirements for engines that have come into contact with fire extinguishing agents, hydraulic fluid, oils or fuel. Contact the local IAE representative for the applicable requirements and procedures when one or more of 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 overtemperature 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 Fig. 70-11-56-991-15000 shows that the disassembly of the engine is necessary after chemical contact with that fire extinguisher agent. Some fire extinguisher agents can cause damage to engine parts at engine operation temperatures.
(3) If you use 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. For many other fire extinguisher agents, it is necessary to disassemble the engine to satisfactorily clean the parts that came into contact with the fire extinguisher agent. Refer to Fig. 70-11-56-991-15000.
(4) Before you do maintenance work on a hangar fire extinguisher system that uses foam, remove all 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 engines.
(5) Detailed gaspath cleaning procedures, as well as instructions for subsequent disassembly, cleaning and inspection as a result of the instructions given in Fig. 70-11-56-991-15000, are provided in the applicable engine manuals.
(6) If an operator knows of airports, test cells or hangars that use fire extinguishing agents that are not specified in Fig. 70-11-56-991-15000, the operator should provide their local IAE representative with the technical data and Material Safety Data Sheets for these fire extinguishing agents for forwarding to IAE Customer Support.
(7) The major concern with the introduction of dry powder or foam chemicals into the engine is corrosion during subsequent engine operation. These materials can be extremely harmful to cold and hot section parts, as exposure to the engine operating environment causes chemical reactions. The engine operating environment can cause chemical reactions of the fire extinguisher agents, which can then cause corrosion on cold-section and/or hot-section parts.
(8) Tests show the results that follow:
(a) Stainless steel alloys, nickel base alloys (coated or uncoated) and cobalt base alloys show a high degree of susceptibility to chemical corrosion from some types of fire extinguisher agents, even at temperatures considerably below the engine operating range.
(b) Titanium, aluminum, magnesium and cadmium plated low alloy steels show no sign of corrosion from bicarbonate compounds (dry powders) at engine operation temperatures.
(c) Titanium in the high pressure compressor can experience stress corrosion from foam chemicals at service operation temperatures. However, many of the foam fire extinguisher agents in Fig. 70-11-56-991-15000 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, overspray on the fan blades can be removed by hand wipe cleaning with aqueous wipe cleaner (Material No.V01-459) .
(d) Some of the Aqueous Film-Forming Foam (AFFFs) and high-expansion foam chemical fire extinguisher agents in Fig. 70-11-56-991-15000 do not cause corrosion on engine material test panels at engine operation temperatures. Fig. 70-11-56-991-15000 shows which AFFFs 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 into contact with the foam.
(9) The Halon 1301 fire extinguisher agent decomposes in fires and at engine hot section operation temperatures to make acids that can cause corrosion of, or stress corrosion cracks in, gaspath materials at high temperatures. Tests show that the Halon 1301 can degrade turbine airfoil coatings at 1800 deg.F (982.22 deg.C) in a short period of time.
(a) When the fire extinguisher systems release Halon 1301 directly into the core of the engine (for example, ground units), the Halon 1301 can come into contact with the turbine airfoils.
(b) Onboard nacelle Halon 1301 fire extinguisher systems usually do not cause the turbine airfoils to come into contact with the Halon 1301 because these systems release the 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 AFFFs in Fig. 70-11-56-991-15000 are National Fire Protection Association (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 Fig. 70-11-56-991-15000 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 AFFFs.
(12) The Protein (P), Fluoroprotein (FP) and Film-Forming Fluoroprotein (FFFP) foams in Fig. 70-11-56-991-15000 are NFPA Class B foam fire extinguisher agents that use protein foaming agents.
Subtask 70-11-56-910-051-A ** ON A/C NOT FOR ALL (1) This task provides operators with information related to the determination of appropriate cleaning and disassembly requirements for engines that have come into contact with fire extinguishing agents, hydraulic fluid, oils or fuel. Contact the local IAE representative for the applicable requirements and procedures when one or more of 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 overtemperature 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 Fig. 70-11-56-991-15000 shows that the disassembly of the engine is necessary after chemical contact with that fire extinguisher agent. Some fire extinguisher agents can cause damage to engine parts at engine operation temperatures.
(3) If you use 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. For many other fire extinguisher agents, it is necessary to disassemble the engine to satisfactorily clean the parts that came into contact with the fire extinguisher agent. Refer to Fig. 70-11-56-991-15000.
(4) Before you do maintenance work on a hangar fire extinguisher system that uses foam, remove all 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 engines.
(5) Detailed gaspath cleaning procedures, as well as instructions for subsequent disassembly, cleaning and inspection as a result of the instructions given in Fig. 70-11-56-991-15000, are provided in the applicable engine manuals.
(6) If an operator knows of airports, test cells or hangars that use fire extinguishing agents that are not specified in Fig. 70-11-56-991-15000, the operator should provide their local IAE representative with the technical data and Material Safety Data Sheets for these fire extinguishing agents for forwarding to IAE Customer Support.
(7) The major concern with the introduction of dry powder or foam chemicals into the engine is corrosion during subsequent engine operation. These materials can be extremely harmful to cold and hot section parts, as exposure to the engine operating environment causes chemical reactions. The engine operating environment can cause chemical reactions of the fire extinguisher agents, which can then cause corrosion on cold-section and/or hot-section parts.
(8) Tests show the results that follow:
(a) Stainless steel alloys, nickel base alloys (coated or uncoated) and cobalt base alloys show a high degree of susceptibility to chemical corrosion from some types of fire extinguisher agents, even at temperatures considerably below the engine operating range.
(b) Titanium, aluminum, magnesium and cadmium plated low alloy steels show no sign of corrosion from bicarbonate compounds (dry powders) at engine operation temperatures.
(c) Titanium in the high pressure compressor can experience stress corrosion from foam chemicals at service operation temperatures. However, many of the foam fire extinguisher agents in Fig. 70-11-56-991-15000 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, overspray on the fan blades can be removed by hand wipe cleaning with aqueous wipe cleaner (Material No.V01-459) .
(d) Some of the Aqueous Film-Forming Foam (AFFFs) and high-expansion foam chemical fire extinguisher agents in Fig. 70-11-56-991-15000 do not cause corrosion on engine material test panels at engine operation temperatures. Fig. 70-11-56-991-15000 shows which AFFFs 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 into contact with the foam.
(9) The Halon 1301 fire extinguisher agent decomposes in fires and at engine hot section operation temperatures to make acids that can cause corrosion of, or stress corrosion cracks in, gaspath materials at high temperatures. Tests show that the Halon 1301 can degrade turbine airfoil coatings at 1800 deg.F (982.22 deg.C) in a short period of time.
(a) When the fire extinguisher systems release Halon 1301 directly into the core of the engine (for example, ground units), the Halon 1301 can come into contact with the turbine airfoils.
(b) Onboard nacelle Halon 1301 fire extinguisher systems usually do not cause the turbine airfoils to come into contact with the Halon 1301 because these systems release the 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 AFFFs in Fig. 70-11-56-991-15000 are National Fire Protection Association (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 Fig. 70-11-56-991-15000 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 AFFFs.
(12) The Protein (P), Fluoroprotein (FP) and Film-Forming Fluoroprotein (FFFP) foams in Fig. 70-11-56-991-15000 are NFPA Class B foam fire extinguisher agents that use protein foaming agents.
B. Procedure and Notes Specific to Fig 70-11-56-991-15000 for 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) Freedom of movement check
1 Turn the rotor manually to do a check to make sure that the rotor turns freely:
a The rotor must turn freely. A rotor that does not turn freely is a sign of damage.
b While the rotor turns, listen for parts that rub against each other or hit other parts that they usually do not come into contact with. Such noises are signs of damage.
(b) Visual inspection
1 Do a visual inspection of the external surfaces of the engine to look for fire damage.
(c) Borescope inspection
1 Do a borescope inspection of the engine to see which parts have fire damage.
(d) If the freedom of movement check finds one or more signs of damage, the visual inspection finds fire damage, 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) See Fig. 70-11-56-991-15000 for the inspection, cleaning and disassembly requirements for engines that come into contact with fire extinguisher agents during a fire. The procedures for the requirement in each column of Fig. 70-11-56-991-15000 are in the subsequent list:
(a) Visual/Borescope Inspection - Fig. 70-11-56-991-15000, Column 2
a Do a visual inspection of the external surfaces of the engine to see which parts have contamination from the fire extinguishing agent.
b Do an internal borescope inspection to see which parts have contamination from the fire extinguishing agent.
2 If Column 2 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, 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.
(b) External Wash - Fig. 70-11-56-991-15000, Column 3
1 If Column 3 of Fig. 70-11-56-991-15000 says "YES" for the fire extinguishing agent, then do an external wash to remove the fire extinguishing agent from the external surfaces of the engine that had chemical contact with the fire extinguishing agent. Use this procedure:
a Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
b Remove grease from the other external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
2 If Column 3 of Fig. 70-11-56-991-15000 says "NO" for the fire extinguishing agent, then do not do an external wash to remove the fire extinguishing agent from the external surfaces of the engine.
3 If Column 3 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to do an external wash to remove the fire extinguishing agent from the external surfaces.
(c) Internal Wash - Fig. 70-11-56-991-15000, Column 4
2 If Column 4 of Fig. 70-11-56-991-15000 says "NO" for the fire extinguishing agent, then it is not permitted to do an internal (gaspath) wash to remove the fire extinguishing agent from the engine gaspath surfaces. Do not operate the engine until the engine parts are cleaned correctly.
3 If Column 4 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to do an internal (gaspath wash to remove the fire extinguishing agent from the engine gaspath surfaces.
(d) Disassemble/Clean By Engine Manual- Fig. 70-11-56-991-15000, Column 5
a Do not operate the engine after the engine has chemical contact with the fire extinguishing agent.
b Complete this procedure as soon as possible after the parts have chemical contact with the fire extinguishing agent.
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 dry chemical fire extinguisher agents or dry powder fire extinguisher agents, disassemble the engine to remove those parts on which the visual/borescope inspection found contamination. However, if a gaspath wash was done while the fire extinguishing agent was on the engine gas path surfaces, then it is necessary to remove and clean all parts in the engine gaspath.
e Use the applicable engine manual instructions to clean the parts.
f After the parts are clean, do a visual inspection of all parts that had chemical contact. Use the applicable engine manual inspection limits.
2 If Column 5 of Fig. 70-11-56-991-15000 says "N/R for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to disassemble the engine to clean the parts that have contamination. Use the subsequent procedure.
Subtask 70-11-56-910-052-A ** ON A/C NOT FOR ALL (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) Freedom of movement check
1 Turn the rotor manually to do a check to make sure that the rotor turns freely:
a The rotor must turn freely. A rotor that does not turn freely is a sign of damage.
b While the rotor turns, listen for parts that rub against each other or hit other parts that they usually do not come into contact with. Such noises are signs of damage.
(b) Visual inspection
1 Do a visual inspection of the external surfaces of the engine to look for fire damage.
(c) Borescope inspection
1 Do a borescope inspection of the engine to see which parts have fire damage.
(d) If the freedom of movement check finds one or more signs of damage, the visual inspection finds fire damage, 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) See Fig. 70-11-56-991-15000 for the inspection, cleaning and disassembly requirements for engines that come into contact with fire extinguisher agents during a fire. The procedures for the requirement in each column of Fig. 70-11-56-991-15000 are in the subsequent list:
(a) Visual/Borescope Inspection - Fig. 70-11-56-991-15000, Column 2
NOTE: This inspection will show how much of the engine you must disassemble to remove the parts that have contamination from the fire extinguishing agent.
NOTE: This inspection does not show contamination from gaseous fire extinguisher agents or vaporizing liquid fire extinguisher agents.
1 If Column 2 of Fig. 70-11-56-991-15000 says "YES" for the fire extinguishing agent, then do the subsequent procedure: a Do a visual inspection of the external surfaces of the engine to see which parts have contamination from the fire extinguishing agent.
b Do an internal borescope inspection to see which parts have contamination from the fire extinguishing agent.
2 If Column 2 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, 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.
(b) External Wash - Fig. 70-11-56-991-15000, Column 3
1 If Column 3 of Fig. 70-11-56-991-15000 says "YES" for the fire extinguishing agent, then do an external wash to remove the fire extinguishing agent from the external surfaces of the engine that had chemical contact with the fire extinguishing agent. Use this procedure:
a Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
b Remove grease from the other external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
2 If Column 3 of Fig. 70-11-56-991-15000 says "NO" for the fire extinguishing agent, then do not do an external wash to remove the fire extinguishing agent from the external surfaces of the engine.
3 If Column 3 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to do an external wash to remove the fire extinguishing agent from the external surfaces.
(c) Internal Wash - Fig. 70-11-56-991-15000, Column 4
CAUTION:
DO NOT OPERATE THE ENGINE AFTER ENGINE GAS PATH PARTS CAME IN CONTACT WITH A FIRE EXTINGUISHING AGENT FOR WHICH COLUMN 4 OF FIGURE 70-11-56-991-15000-01-A SPECIFIES "NO". IF YOU DO, THE FIRE EXTINGUISHING AGENT CAN CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.
1 If Column 4 of Fig. 70-11-56-991-15000 says "YES" for the fire extinguishing agent, then do an internal (gaspath) wash of the engine to remove the fire extinguishing agent from the engine gaspath surfaces (Ref. AMM TASK 72-00-00-100-010). 2 If Column 4 of Fig. 70-11-56-991-15000 says "NO" for the fire extinguishing agent, then it is not permitted to do an internal (gaspath) wash to remove the fire extinguishing agent from the engine gaspath surfaces. Do not operate the engine until the engine parts are cleaned correctly.
NOTE: It is not possible to fully remove foam fire extinguisher agents from the engine gaspath by an internal wash (with plain water or with detergent).
NOTE: Dry chemical fire extinguisher agents and dry powder fire extinguisher agents are not water soluble. Thus, an internal wash will cause these materials to cake, bond to engine parts or cause air holes and cavities to become clogged.
a If an internal wash is done while the fire extinguishing agent is on engine gaspath surfaces, then it will be necessary to remove and clean all the parts in the engine gaspath. 3 If Column 4 of Fig. 70-11-56-991-15000 says "N/R" for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to do an internal (gaspath wash to remove the fire extinguishing agent from the engine gaspath surfaces.
(d) Disassemble/Clean By Engine Manual- Fig. 70-11-56-991-15000, Column 5
CAUTION:
DO NOT OPERATE THE ENGINE AFTER ENGINE GAS PATH PARTS CAME IN CONTACT WITH A FIRE EXTINGUISHING AGENT FOR WHICH COLUMN 5 OF FIGURE 70-11-56-991-15000-01-A SPECIFIES "YES". IF YOU DO, THE FIRE EXTINGUISHING AGENT CAN CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.
1 If Column 5 of Fig. 70-11-56-991-15000 says "YES" for the fire extinguishing agent, then disassemble the engine to clean the parts that have contamination. Use the subsequent procedure: a Do not operate the engine after the engine has chemical contact with the fire extinguishing agent.
b Complete this procedure as soon as possible after the parts have chemical contact with the fire extinguishing agent.
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 dry chemical fire extinguisher agents or dry powder fire extinguisher agents, disassemble the engine to remove those parts on which the visual/borescope inspection found contamination. However, if a gaspath wash was done while the fire extinguishing agent was on the engine gas path surfaces, then it is necessary to remove and clean all parts in the engine gaspath.
e Use the applicable engine manual instructions to clean the parts.
f After the parts are clean, do a visual inspection of all parts that had chemical contact. Use the applicable engine manual inspection limits.
2 If Column 5 of Fig. 70-11-56-991-15000 says "N/R for the fire extinguishing agent, then it is not required (that is, it is permitted, but not necessary) to disassemble the engine to clean the parts that have contamination. Use the subsequent procedure.
C. Procedure for Cleaning after a Hydraulic Fluid Leak
(1) After a hydraulic fluid leak, do the subsequent procedure:
(a) Complete this procedure as soon as possible after contamination from hydraulic fluid occurs.
(b) Do a visual inspection of the external surfaces of the engine to see which parts have contamination from hydraulic fluid.
1 If the external surfaces show baked-on or burned hydraulic fluid, contact the local IAE representative for the applicable requirements and procedures.
2 If the 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 entered the engine through the bleed valves, the inlet or the exhaust, then do an internal borescope inspection to see which parts have contamination from the hydraulic fluid.
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 Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Remove grease from the external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
b IAE V2500 Standard Practices Manual Task 70-11-26-30-503 Procedure to Locally Swab or Wipe Clean with Solvent. Refer to IAE V2500 IETM Publication Reference SPP-V2500-1IA.
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 the parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
2 Use the applicable engine manual 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 engine manual inspection limits.
(f) If the 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 the engine gaspath surfaces have contamination from hydraulic fluid.
2 Disassemble the engine to remove the 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 engine manual instructions to clean the parts.
4 After the parts are clean, do a visual inspection of all parts that had contamination from hydraulic fluid. Use the applicable engine manual inspection limits.
Subtask 70-11-56-910-053-A ** ON A/C NOT FOR ALL (1) After a hydraulic fluid leak, do the subsequent procedure:
(a) Complete this procedure as soon as possible after contamination from hydraulic fluid occurs.
(b) Do a visual inspection of the external surfaces of the engine to see which parts have contamination from hydraulic fluid.
1 If the external surfaces show baked-on or burned hydraulic fluid, contact the local IAE representative for the applicable requirements and procedures.
2 If the 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 entered the engine through the 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 the 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 Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Remove grease from the external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
b IAE V2500 Standard Practices Manual Task 70-11-26-30-503 Procedure to Locally Swab or Wipe Clean with Solvent. Refer to IAE V2500 IETM Publication Reference SPP-V2500-1IA.
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 the parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
2 Use the applicable engine manual 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 engine manual inspection limits.
(f) If the 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 the engine gaspath surfaces have contamination from hydraulic fluid.
2 Disassemble the engine to remove the 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 engine manual instructions to clean the parts.
4 After the parts are clean, do a visual inspection of all parts that had contamination from hydraulic fluid. Use the applicable engine manual inspection limits.
D. Procedures for 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 Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Remove grease from the external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
b IAE V2500 Standard Practices Manual Task 70-11-26-30-503 The Procedure to Locally Swab or Wipe Clean with Solvent. Refer to IAE V2500 IETM Publication Reference SPP-V2500-1IA.
3 Do an internal (gaspath) wash of the engine to remove the oil or fuel from the engine gaspath surfaces (Ref. AMM TASK 72-00-00-100-010).
(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 Clean the electrical contact points and wiring harnesses (Ref. AMM TASK 70-11-50-100-020).
2 Use one of the procedures in the subsequent list to clean other external surfaces:
a Remove grease from the external surfaces of the engine (Ref. AMM TASK 70-11-50-100-010).
b IAE V2500 Standard Practices Manual Task 70-11-26-30-503 The Procedure to Locally Swab or Wipe Clean with Solvent. Refer to IAE V2500 IETM Publication Reference SPP-V2500-1IA.
3 Do an internal (gaspath) wash of the engine to remove the oil or fuel from the engine gaspath surfaces (Ref. AMM TASK 72-00-00-100-010).