MIL-PRF-26139D
3.11.7.1 Connection. Pressure gages shall be connected with flexible AN or MS-type hose, or
commercial equivalent, of sufficient length to permit removal and installation from the front of
the panel.
3.11.7.2 Gage test fitting. The following three fittings shall be mounted on the control panel
adjacent to the appropriate gages, and the panel marked to indicate that the fittings are gage test
connections.
AS5406-4D nipple
AS5178-4D nut
AN929-4
3.11.7.3 Tubing. The interconnecting air lines shall be One Half (1/2) inch OD tubing and
connected to the hoses and takeoff points by means of AN fittings. The static pressure line outlet
from the tester for connection to the static hose shall be an AS5406-8D fitting and an AS5178-
8D nut with an AN929-8 dust cap. One fourth (1/4) inch OD tubing may be used for internal
connection lines for static systems only.
3.11.8 Blower pressure gage. A pressure gage having a minimum dial size of 3 inches, a range of
0 to 20 PSI, and minimum accuracy of 1 percent of full scale shall be furnished to indicate the
blower pressure at the inlet side of the flowmeter.
3.11.9 Canopy seal pressure gage. A pressure gage with a scale range of 0 to 100 PSI, accurate to
within 2 percent of full scale, shall be provided in the canopy seal system.
3.11.10 Hourmeter. A hourmeter having a range of from 0 to 9,999 hours shall be provided to
record the hours of operation of the blower motor.
3.12 Housing. The tester components shall be completely enclosed in a weather-resistant
housing. The housing shall utilize doors and adjustable louvers as required. The housing shall be
capable of supporting a 200-pound weight distributed evenly over an area 4.50 by 5 inches at any
location on top of the housing. The housing shall be adequately braced to prevent distortion or
excessive vibration during handling and operation of the tester or handling of the housing while
being removed from the tester.
3.12.1 Doors. The housing shall be provided with sufficient access and ventilating doors and
adjustable louvers to permit access for operating and servicing, and to ventilate the tester. The
doors and louvers in the housing shall be free from binding and easily operated with one hand.
Provisions shall be incorporated to secure the doors rigidly in the fully open or fully closed
position. An access port in the housing must be provided to allow removal of temperature sensor
from the discharge flowmeter.
3.12.2 Handles. The housing shall be easily removable by actuating not more than 12 quick-
acting disconnecting fasteners and lifting or sliding the entire housing off the remainder of the
tester. Handles or lifting eyes shall be provided for this purpose.
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