MIL-STD-801 Inspection And Acceptance Standards For Fuel Cells And FittingsThis standard establishes a test method standard for fuel cells and fuel cell fittings. This standard applies to all fuel cells manufactured in accordance with MIL-DTL-5578, MIL-DTL-6396 except Type I, and MIL-DTL-27422.

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Item

Defects

Defect Classes

Types of Fuel Cells/Location

Fittings

Minor

Major

Critical

Bladder

Cells

Self- sealing Cells

Crash Resistant Cells

Cell

Interior

Cell

Exterior

Installed

Replacement

1

AREAS OF NON-ADHESION OR BLISTERS BETWEEN LINER LAPS

a. 1/4 inch maximum dimension - average 1 per 5 linear feet of splice with maximum of 5 in any 5 foot length of splice.

x

-

-

x

x

x

-

-

-

b. 1/2 inch maximum dimension - average 1 per 5 linear feet of splice with maximum of 5 in any 5 foot length of splice.

x

-

-

x

x

-

-

-

c. Areas in excess of 1a or 1b.

-

x

-

x

x

x

x

-

-

-

2

BLISTERS BETWEEN PLIES OR BETWEEN INNER LINER AND SEALANT

a.1-inch maximum dimension; not to exceed average of 1 per 5 square

foot area; maximum of 5 inches any one 5 square foot area; minimum of 6 inches solid bond between delaminations/separations.

x

-

-

x

x

x

x

-

-

-

b. Blisters between plies in excess of 2a.

-

x

-

x

x

x

x

-

-

-

3

BLISTERS BETWEEN FITTING FLANGE AND ADJACENT PLY

a. 1/4 inch maximum dimension - Maximum of 1 in any 1 linear foot of flange or maximum of 1 per fitting when flange is less than 1 linear foot.

x

-

-

x

x

x

x

x

x

-

b. In excess of 3a.

-

x

-

x

x

x

x

x

x

-

4

BLISTERS BETWEEN ATTACHMENTS AND OUTER LAYER OR INNER PLY

a. Not exceeding 15 percent looseness provided a continuous bond at least 1/4 inch wide is maintained around edge except at step-off where Item 8 applies.

x

-

-

x

x

x

x

x

-

-

b. In excess of 4a.

-

x

-

x

x

x

x

x

-

-

5

CHANNELS BETWEEN PLIES AT BURIED EDGE OF LAP SPLICES AND IN TRANSITION AREA, ENTIRE LENGTH OF SPLICE

a. In excess of 1/4 inch in width

-

x

-

x

x

x

x

x

-

-

b. In excess of 3/8 inch in width for crash resistant cells

-

x

-

x

x

x

x

x

-

-