barfield 1811GA Series User Instruction Manual

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barfield 1811GA Series User Instruction Manual Manual pdf 32 page image

56-101-00184 / 00185 Rev. I CH. 3September 24, 2014 Page 20 of 56B. Static Leak Test (for non-pressurized aircraft only)Note: When performing the Static Leak Test or if the aircraft airspeed indicator has arange of 150 knots (175 MPH) or less, do not exceed 1,000 ft increase abovefield level ambient. (During the test, both the aircraft and the T/S airspeedindicators increase as the altitude increases.)Caution: Do not allow the aircraft airspeed to exceed full-scale travel. If a step failsduring testing, close the STATIC CONTROL (#7) fully CW. Then, gently,open the CROSSBLEED VALVE (#8) and return the system to ambientbefore disconnecting the T/S.(1) Do not exceed range of aircraft vertical speed indicator (VSI) while gently openingSTATIC CONTROL (#7) (CCW) to produce an altimeter reading 1,000 feet aboveoriginal reading obtain in section 7A (Static System Connection), paragraph (5).Close valve fully (CW).(2) After instrument indications stabilized, monitor ALTIMETER (#5) for one minute.Ensure that the altimeter decreases no more than 100 feet plus the leak rate(determined from section 5. PRETESTS, in the Static Pretest).(3) After test is complete and taking care not to exceed vertical speed range, graduallyopen (CCW) the CROSSBLEED CONTROL (#8) to ambient.(4) Once the system returns to ambient pressure, open the CROSSBLEED CONTROL(#8) and STATIC VENT (#10) fully (CCW). Disconnect the aircraft line from theSTATIC PORT (#6).(5) Gradually open (CCW) the STATIC CONTROL (#7) to bleed off vacuum supply.Once the VACUUM GAUGE (#9) returns to zero, close the STATIC CONTROL (#7)fully (CW).Note: The vacuum supply may remain without causing an adverse effect to theT/S.C. Static Leak Test (for Pressurized Aircraft or for altitude indication test more than 1,000feet above field level ambient)(1) Open the STATIC VENT (#10) and CROSSBLEED CONTROL (#8) valves fully(CCW).(2) Close all other valves (#3, #7, #17, and #19) fully (CW).(3) Operate the VACUUM PUMP (#11) to develop 20 inHg or more on the VACUUMGAUGE (#9).Note: If the system needs additional vacuum, close the STATIC CONTROL (#7)before operating the hand pump.