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|  MIL-T-62531(AT)
APPENDIX A
Verification Guidance
If interference is encountered, relocation or rerouting of the item(s) is required.
Verification Lessons Learned
3.4.5.6 Steam and water jet cleaning. The engine and all its components shall withstand
waterjet cleaning with cleaner and high pressure steam conforming to P-C-437 without
deterioration of seals and hoses or water leakage past seals, gaskets, or other similar defects.
Paint removal shall not be a basis for rejection. Steam and water jet cleaning are defined as
follows:
The jet is applied perpendicular to the surface being cleaned at a distance of not more
than 0.3m from the surface for steam cleaning, and not more than 1.5m from the surface
for water jet cleaning. The jet pressure shall not be less than 689 kPa and not more than
758 kPa.
Rationale
Vehicle engines are prone to becoming covered with road dust, oil, anti-freeze, water and
brake fluid. High pressure steam and cleaning solution is the approved method of removing
these contaminents.
Guidance
It is essential that the engine and components be designed and manufactured to withstand the
effects of high pressure steam and waterjet cleaning and the cleaning solvents specified.
Lessons Learned
4.4.5.6 Steam and water jet cleaning test. To determine conformance to 3.4.5.6, the engine
shall be steam and water jet cleaned during FPVI testing and subsequent to all other tests. The
engine shall be equipped with all components listed in 3.4.5. The engine, and components shall
be dissasembled to the extent necessary to determine probable entry of water or deterioration to
seals, hose, gaskets, or driving belts. Any evidence of water entry or deterioration of seals, hose,
gaskets, or driving belts resulting from the above testing shall be cause for rejection.
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