MIL-DTL-5099C
3.5 Cover glass. The quality of the cover glass shall be in accordance with
ASTM C1036, quality Q1, for flat sheet glass. Any flaws permitted by ASTM C1036 shall not
interfere with reading of the dial. The dimensions of the cover glass shall be in accordance with
MS28105.
3.5.1 Cover glass mounting. The distance from the inner surface of the cover glass to
the surface of the dial on which the marking is applied shall not exceed 0.125 inch.
3.6 Performance. The indicator shall perform satisfactorily when subjected to the tests
shown in section 4 of this specification.
3.6.1 Mean-time between failures (MTBF). The indicator shall have a MTBF
(θ1 - θ0/θ1) of not less than 2,000 hours, based on a decision risk of 10 percent and a
discrimination ratio (θ0/θ1) of 1.5:1. In instances where the manufacturer does not have
historical data for calculation of MTBF, the procuring activity may specify reliability assurance
testing (see 4.2.2).
3.7 Nameplate. A nameplate shall be securely attached to the exterior of the case and
shall be marked in accordance with the requirements of MIL-STD-130, except that the national
stock number shall be omitted.
3.7.1 Manufacturer's part number. The manufacturer's part number on the nameplate
shall be identical with the manufacturer's engineering production drawing number including
applicable dash numbers if the drawing is tabulated and covers more than one part.
3.8 Interchangeability. All parts having the same manufacturer's part number shall be
directly and completely interchangeable with each other with respect to installation and
performance. Changes in manufacturer's part numbers shall be governed by the drawing number
requirements of MIL-STD-31000.
3.9 Mounting hardware. The mounting flange shall be capable of retaining clip-in lock
nuts conforming to legacy part number MS33737-11 in accordance with NASM33737.
3.9.1 Mounting lugs. Mounting lugs of the complete assembled case shall each
withstand for 1 minute, without fracture, a load of 175 pounds applied along the mounting hole
axis and toward the front of the instrument.
3.10 Shipping plug. A suitable shipping plug shall be screwed in the pressure insert for
shipping purposes. The plug shall incorporate a vent consisting of a hole 0.062 ±0.016 inch in
diameter.
3.11 Mechanism adjustment. The mechanism shall be provided with means of adjusting
or correcting the indications to conform to the performance requirements herein, in case this
becomes necessary during the life of the indicator. The calibration adjustment shall not affect
the temperature performance of the instrument. This means of adjustment shall be reasonably
simple to manipulate and of such nature that adjustment can be accomplished by tools ordinarily
possessed by an instrument repair technician.
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