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|  MIL-T-62531(AT)
APPENDIX A
4.7.3 Fording test. To determine conformance to 3.7.3, the vehicle shall operate in a
minimum of _____ mm of water for at least 15 minutes. Immediately following the fording test,
the wheel hubs shall be removed and examined for water contamination. Oil samples shall be
taken from the engine, transmission, transfer transmission and front, intermediate and rear
differentials. Water contamination in excess of one percent by volume shall be cause for
rejection. For air-brake systems, the brake actuation and times required by FMVSS 1212 will
not be compromised.
Verification Rationale
Verification of the vehicles capability to operate in water for limited periods of time without
damage or contamination of lubricants shall be determined by disassembling to the extent
necessary for inspection.
Verification Guidance
Insert required data for water depth. Following disassembly of wheel hubs, examine all
internal areas for evidence of water contamination. Take oil samples from the engine,
transmission, transfer case, differentials. The oil samples shall be delivered to a laboratory
approved by the Government for analysis.
Verification Lessons Learned
3.7.3.1 Deep water fording. With the deep water fording kit installed, vehicles shall ford
hard-bottomed, fresh or salt water crossings, remaining immersed for a period of 30 minutes.
While still submerged, the engine shall restart after being stopped for 3 minutes and then
operated for an additional 15 minutes, without damage to the vehicle. The expansible van truck
shall ford water up to the bottom of the floor. All other models shall ford water up to a depth of
______ mm, including wave height. With the fording kit installed, the vehicle shall operate
continuously on land, before and after fording operations, without damage to the vehicle. At the
conclusion of such operation, a maximum of one percent water contamination by volume in the
lubricating oil is permissible.
Rationale
With the deep water fording kits installed vehicles shall be capable of operating while
submerged in water up to the depths specified without deleterious effects on any part of the
vehicle. Under emergency conditions it may be necessary to move materials or personnel
through flood waters or across rivers or streams where there are no bridges or where it is
impractical to travel to a bridged area.
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