Export Control
EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.Copyright
© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).Applicability
All
Common Information
TASK 70-11-56-110-501 Cleaning Requirements After Chemical Contact With Fire Extinguishing Agents, Hydraulic Fluid, Oil Or Fuel
General
This task provides operators and Maintenance, Repair and Operations (MRO) providers with information in determining appropriate cleaning and disassembly requirements for engines that have come into contact with fire extinguishing agents because of an engine fire, or that have come into contact with 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:
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).
The engine comes in contact with a fire extinguisher agent that is not listed in Table.
The engine comes in contact with a fire extinguisher agent because of a fire, and the fire temperature was higher than the engine over-temperature limits
The engine comes in contact with a fire extinguisher agent because of a fire, and the fire involved areas of the engine other than the burner and gaspath areas.
After a fire extinguisher agent goes into the engine, do not operate the engine if Table shows that 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.
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 in contact with the fire extinguisher agent. See Table.
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.
Detailed gaspath cleaning procedures, as well as instructions for subsequent disassembly, cleaning and inspection as a result of the instructions given in Table, are provided in the applicable engine manuals.
If an operator knows of airports, test cells or hangars that use fire extinguishing agents that are not specified in Table, 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.
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 then can cause corrosion on cold-section and/or hot-section parts.
Tests show the results that follow:
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.
Titanium, aluminium, magnesium and cadmium plated low alloy steels show no sign of corrosion from bicarbonate compounds (dry powders) at engine operation temperatures.
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 Table 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 CoMat 01-459 AQUEOUS WIPE CLEANER.
Some of the Aqueous Film-Forming Foam (AFFF) and high-expansion foam chemical fire extinguisher agents in Table do not cause corrosion on engine material test panels at engine operation temperatures. Table 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.
Halon 1301 fire extinguisher agent decomposes in fire 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 Halon 1301 can degrade turbine airfoil coatings at 1800F (982C) in a short period of time.
Fire extinguisher systems that release Halon 1301 directly into the core of the engine (for example, ground units) can cause the turbine airfoils to come in contact with the Halon 1301.
Onboard nacelle Halon 1301 fire extinguisher systems usually do not cause the turbine airfoils to come in 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.
The Aqueous Film-Forming Foams (AFFF) in Table 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.
The high-expansion foams in Table 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 Aqueous Film-Forming Foams (AFFF).
The Protein (P), FluoroProtein (FP), and Film-Forming FluoroProtein (FFFP) foams in Table are NFPA Class B foam fire extinguisher agents that use protein foaming agents.
NOTE
Preliminary Requirements
Pre-Conditions
NONESupport Equipment
NONEConsumables, Materials and Expendables
| Name | Manufacturer | Part Number / Identification | Quantity | Remark |
|---|---|---|---|---|
| CoMat 01-459 AQUEOUS WIPE CLEANER | 71410 | CoMat 01-459 |
Spares
NONESafety Requirements
WARNING
Procedure
The rotor must turn freely. A rotor that does not turn freely is a sign of damage.
While the rotor turns, listen for parts that rub against or hit other parts that they usually do not contact. Such noises are signs of damage.
Turn the rotor manually to do a check to make sure that the rotor turns freely:
Freedom of Movement Check
Do a visual inspection of the external surfaces of the engine to look for fire damage.
Visual Inspection
Do a borescope inspection of the engine to see which parts have fire damage.
Borescope Inspection
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 to disassemble the engine to remove the parts that have damage.
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:
Do a visual inspection of the external surfaces of the engine to see which parts have contamination from the fire extinguishing agent.
Do an internal borescope inspection to see which parts have contamination from the fire extinguishing agent.
If Column 2 of Table states YES for the fire extinguishing agent, then do the subsequent procedure:
If Column 2 of Table states 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.
Visual or Borescope Inspection - Table, 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.Use SPM TASK 70-11-57-110-501 the procedure to clean electrical contact points and wiring harnesses.
Use SPM TASK 70-11-50-300-503 to clean other external surfaces.
If Column 3 of Table states 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 the following procedure:
If Column 3 of Table states NO for the fire extinguishing agent, then do not do an external wash to remove the fire extinguishing agent from external surfaces of the engine.
If Column 3 of Table states N/R for the fire extinguishing agent, then it is not necessary (that is, it is permitted, but not necessary) to do an external wash to remove the fire extinguishing agent from the external surfaces.
External Wash - Table, Column 3
If Column 4 of Table states 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. Refer to SPM TASK 72-00-00-100-001-A00 (CLEANING-001) and TASK 72-00-00-100-001-B00 (CLEANING-001), to clean the engine gaspath for performance improvement for the applicable gaspath wash procedures.
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 parts in the engine gaspath.
If Column 4 of Table states 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.
CAUTION
IF YOU OPERATE THE ENGINE AFTER ENGINE GASPATH PARTS COME IN CONTACT WITH A FIRE EXTINGUISHING AGENT FOR WHICH COLUMN 4 OF TABLE 6 STATES NO, THE FIRE EXTINGUISHING AGENT COULD CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.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.If Column 4 of Table states 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 engine gaspath surfaces.
Internal Wash - Table, Column 4
Do not operate the engine after the engine has chemical contact with the fire extinguishing agent.
Complete this procedure as soon as possible after the parts have chemical contact with the fire extinguishing agent.
For gaseous fire extinguisher agents or vaporizing liquid fire extinguisher agents, disassemble the engine to remove all parts in the engine gaspath.
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 or borescope inspection found contamination. However, if a gaspath wash was done while the fire extinguishing agent was on engine gaspath surfaces, then it is necessary to remove and clean all parts in the engine gaspath.
Use the applicable engine manual instructions to clean the parts.
After the parts are clean, do a visual inspection of all parts that had chemical contact. Use the applicable engine manual inspection limits.
CAUTION
IF YOU OPERATE THE ENGINE AFTER ENGINE GASPATH PARTS COME IN CONTACT WITH A FIRE EXTINGUISHING AGENT FOR WHICH COLUMN 5 OF TABLE 6 SAYS YES, THE FIRE EXTINGUISHING AGENT COULD CAUSE DAMAGE TO THESE PARTS AT ENGINE OPERATION TEMPERATURES.If Column 5 of Table states YES for the fire extinguishing agent, then disassemble the engine to clean the parts that have contamination. Use the subsequent procedure:
If Column 5 of Table states N/R for the fire extinguishing agent, then it is not necessary (that is, it is permitted, but not necessary) to disassemble the engine to clean the parts that have contamination.
Disassemble/Clean By Engine Manual - Table, Column 5
See Table 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 Table are in the subsequent list:
SUBTASK 70-11-56-501-001 Procedures and Notes Specific to Table 6 for Cleaning After Chemical Contact with Fire Extinguisher Agents
SUBTASK 70-11-56-501-002 Table 6
Table 1. Cleaning Requirements After Chemical Contact With Fire Extinguishing Agents 1
2
3
4
5
FIRE EXTINGUISHER AGENT TYPE
VISUAL/ BORESCOPE INSPECTION
EXTERNAL WASH
INTERNAL WASH
DISASSEMBLE/ CLEAN BY ENGINE MANUAL
WATER:
WATER
N/R
N/R
N/R
N/R
WATER FOG
N/R
N/R
N/R
N/R
GASEOUS:
ANSUL INERGEN(R) (N2 + Ar + CO2)
N/R
N/R
N/R
N/R
CARBON DIOXIDE
N/R
N/R
N/R
N/R
NITROGEN
N/R
N/R
N/R
N/R
SULFUR HEXAFLUORIDE (SF6)
N/R
NO
NO
YES
VAPORIZING LIQUID:
DUPONT FE-232(TM) (HCFC-123)
N/R
NO
NO
YES
DUPONT FE-36(TM) (HFC-236fa)
N/R
NO
NO
YES
DUPONT FE-227(TM)/FM-200(R) (HFC-227ea)
N/R
NO
NO
YES
GREAT LAKES FM-100 (HBFC-22B1)
N/R
N/R
N/R
N/R
HALON 1011 (HBCC-30B1)
N/R
NO
NO
YES
HALON 1202 (BFC-12B2)
N/R
NO
NO
YES
HALON 1211 (BCFC-12B1)
N/R
NO
NO
YES
HALON 1301 (BFC-13B1) -NACELLE DISCHARGE/RELEASE
N/R
N/R
N/R
N/R
HALON 1301 (BFC-13B1) - IN PRIMARY GASPATH
N/R
NO
NO
YES
HALON 2402 (BFC-114B2)
N/R
NO
NO
YES
HALOTRON(R) I (HCFC-123 BLEND)
N/R
NO
NO
YES
HALOTRON(R) II (HFC-134a + HFC-125 + CO2)
N/R
NO
NO
YES
DRY CHEMICAL:
NFPA ABC MULTI-CLASS:
AMMONIUM PHOSPHATE
YES
NO
NO
YES
NFPA BC MULTI-CLASS:
PURPLE K
YES
NO
NO
YES
SODIUM BICARBONATE
YES
NO
NO
YES
NFPA CLASS D:
FOUNDRY FLUX
YES
NO
NO
YES
ANSUL MET-L-X(R)
YES
NO
NO
YES
FYR-FYTER METAL FYR
YES
NO
NO
YES
M-1
YES
NO
NO
YES
PYRO-CHEM(R) G-1
YES
NO
NO
YES
FOAM:
AQUEOUS FILM-FORMING FOAMS (AFFF):
3M FC-203CF LIGHT WATER(TM) AFFF 3%
N/R
N/R
N/R
N/R
ANSUL ANSULITE(R) 1%
N/R
N/R
N/R
N/R
ANSUL ANSULITE(R) 3% (AFC-3A)
N/R
N/R
N/R
N/R
ANSUL ANSULITE(R) PREMIUM 3% (AFC-5-A)
N/R
N/R
N/R
N/R
CHEMGUARD C301MS 3% AFFF MIL SPEC
N/R
N/R
N/R
N/R
CHEMGUARD C-303 3% AFFF
N/R
N/R
N/R
N/R
K.V. FIRE CHEMICALS INDIA KV-LITE AFFF 6%
N/R
N/R
N/R
N/R
ALL OTHER AQUEOUS FILM-FORMING FOAMS
YES
NO
NO
YES
HIGH EXPANSION FOAMS:
ANSUL JET-X 2%
N/R
N/R
N/R
N/R
ANSUL JET-X(R) 2-3/4%
N/R
N/R
N/R
N/R
NATIONAL FOAM HI-EX(R) 2%
N/R
N/R
N/R
N/R
ALL OTHER HIGH EXPANSION FOAMS
YES
NO
NO
YES
OTHER FOAM TYPES:
PROTEIN (P, FP, OR FFFP)
YES
NO
NO
YES
SODA-ACID
YES
NO
NO
YES
TRIMETHOXYBOROXINE (TMB)
YES
NO
NO
YES
WATER-GLYCOL
YES
NO
NO
YES
Refer to the text for the full requirements.
This table was formerly Figure 901.
Complete this procedure as soon as possible after contamination from hydraulic fluid occurs.
If external surfaces show baked-on or burned hydraulic fluid, contact the local IAE representative for the applicable requirements and procedures.
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.
Do a visual inspection of the external surfaces of the engine to see which parts have contamination from hydraulic fluid.
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.
It is not permitted to do an internal wash to remove hydraulic fluid from the gaspath surfaces.
If the visual inspection of the external surfaces of the engine finds indications that hydraulic fluid entered 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.Use TASK 70-11-57-110-501 the procedure to clean electrical contact points and wiring harnesses.
Use TASK 70-11-50-300-503 to degrease the exterior of the engine.
Use TASK 70-11-26-300-503 the procedure to locally swab or wipe clean with solvent.
Use one of the procedures in the subsequent list to clean other external surfaces:
After the above steps, do a visual inspection to look for remaining hydraulic fluid varnish or baked-on hydraulic fluid.
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:
Disassemble the engine to remove those parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
Use the applicable engine manual instructions to clean the parts that show remaining hydraulic fluid varnish or baked-on hydraulic fluid.
After the parts are clean, do a visual inspection of the parts. Use the applicable engine manual inspection limits.
If the visual inspection after the external wash finds remaining hydraulic fluid varnish or baked-on hydraulic fluid, then do the subsequent procedure:
Do not operate the engine if engine gaspath surfaces have contamination from hydraulic fluid.
If you or some other operator did a gaspath wash after the contamination of engine gaspath surfaces from hydraulic fluid occurred, then it is necessary to remove and clean all parts in the engine gaspath.
Disassemble the engine to remove those gaspath parts on which the visual/borescope inspection found contamination from hydraulic fluid.
Use the applicable engine manual instructions to clean the parts.
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.
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:
After a hydraulic fluid leak, do the subsequent procedure:
SUBTASK 70-11-56-501-003 Procedures for Cleaning after a Hydraulic Fluid Leak
Use TASK 70-11-57-110-501 the procedure to clean electrical contact points and wiring harnesses.
Use TASK 70-11-50-300-503 to degrease the exterior of the engine.
Use TASK 70-11-26-300-503 the procedure to locally swab or wipe clean with solvent.
Use one of the procedures in the subsequent list to clean other external surfaces:
Do an internal (gaspath) wash of the engine to remove the oil or fuel from the engine gaspath surfaces. Refer to TASK 72-00-00-100-001-A00 (CLEANING-001) and TASK 72-00-00-100-001-B00 (CLEANING-001), to clean the engine gaspath for performance improvement for the applicable gaspath wash procedures.
Do an external wash to remove the oil or fuel from the external surfaces of the engine. Do the subsequent steps:
After an oil or fuel leak, do the subsequent procedure:
SUBTASK 70-11-56-501-004 Procedures for Cleaning after an Oil or Fuel Leak