AIR FORCE A-A-59928 A-2013 METER FUEL FLOW PORTABLE.pdf

《AIR FORCE A-A-59928 A-2013 METER FUEL FLOW PORTABLE.pdf》由会员分享，可在线阅读，更多相关《AIR FORCE A-A-59928 A-2013 METER FUEL FLOW PORTABLE.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、 Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to: WR-ALC/404 SCMS/GUEEA, Robins AFB GA 31098-1670. Since contact information can change, you may want to verify the currency of this address information usin

2、g the ASSIST Online database at https:/assist.dla.mil . AMSC N/A FSC 6685 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. INCH-POUND A-A-59928A 18 JUL 2013 SUPERCEDING A-A-59928 26 JUNE 2013 COMMERCIAL ITEM DESCRIPTION METER, FUEL FLOW, PORTABLE The General Services

3、 Administration has authorized the use of this Commercial Item Description (CID) as a replacement for PD07WRGBZOENI27 Rev 3, for all federal agencies. 1. SCOPE. SCOPE: The test set covered by this specification is intended to be a portable fuel flow meter unit and eight test cables. The Fuel Flow Me

4、ter Test Set (here on referred to as test set or flow meter) is a support equipment test set which is used for depot and flight line test of fuel flow meter system components. The test set complies with Class 1 according to MIL-PRF-28800, is used to test flow meter transmitters, indicators of the se

5、cond harmonic type, total summation indicators, individual summation indicators and system power supplies. 2. SALIENT CHARACTERISTICS. 2.1 Components. The test set consists of a high brightness display, master transmitter assembly, linear transmitter, multi-meter, Test Selector Switch, Cables. Drawi

6、ngs of all cables will be provided. All cables and manuals shall fit within the case. COMPONENT Military Specification Item Type Indicator, Individual Rate MIL-I-25906 EFU-3A Indicator, Individual Summation MIL-I-25324 MIL-I-25907 MA-7A, MA-7 EFU4/A Indicator, Total Summation MIL-I-25325 MIL-I-25908

7、 MA-8 EFU-5/A Transmitter MIL-T-8249 MIL-T-25905 MIL-T-26298 MB-2 TRU-7/A TRU-6/A Performance Specification MIL-PRF-28800 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59928A 2 Cable Assembly Part Number Cage Code Length 5796297G700 See MIL-T-2

8、6298 TJ-49,TJ-51 9172332-10 98750 10 inches DJ-71 9172332-30 98750 10 inches DJ-72 9172332-50 98750 10 inches DJ-64 9172332-70 98750 10 inches TJ-50 9172332-110 98750 22 feet Main 9172332-130 98750 5 feet 5 inches TJ-51E 9172332-150 98750 10 inches GND-1 9172332-170 98750 10 feet DJ-71A 9172332-190

9、98750 10 inches TBD Used to drive all 8 FFIs at the same time B-52 requirement TBD Used to test indicators from engine connector B-52 requirement Function Selector/Switch Function Function Switch Allows test set to perform: Self Test; 4Hz Power Supply Check; Transmitter; Individual, Linear and total

10、 indicator. Mode Switch Allows displays in DEGREES, 12K PPH, 15K PPH, LINE FREQ DISP, STEP MODE Master XMTR Sets master transmitter to desired settings Linear XMTR PPH X 100 Checks scale error and operation of Type 8DJ72 total summation indicators. 2.2 Functional requirements. This test set shall be

11、, at minimum, capable of: a. Test the output signals of flow-meter transmitters of the second-harmonic type. b. Generate a calibration signal used to test flow-meter indicators of the second-harmonic type. c. Measure the output voltage of individual summation indicators. d. Generate a calibration vo

12、ltage used to test total summation indicators. e. Check output continuity of flow-meter system power supplies. f. Measure output frequency of flow-meter system power supplies. g. Isolate the malfunction of a defective system component through substitution of individual components. h. Identify the fa

13、iled Components. Per X-Technologies, there is a user desire to move the tester internal Circuit Breaker, exhibited by existing units, to the front panel to the location currently occupied by an unused 28 VDC input connector, and delete the associated 28 VDC connector, modules and circuitry. This wou

14、ld allow the CB to be easily reset. Per X-Technologies, none of the platforms use the 28 VDC function. If true, this 28 VDC function could be removed from applicable paragraphs below. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59928A 3 2.3 C

15、arrying Case. The carrying case shall be 24 X 14 X 22 inch or less. A handle for carrying the test set shall be attached to the case. A mechanism for locking the test set shall be provided. The weight of the test set including the test cables shall be 35 pounds or less. The case shall be airtight an

16、d a mechanism will be added for equalizing air pressure within the enclosure, when the enclosure is sealed. The mechanism provided shall not protrude beyond the enclosure. 2.4 Interface. An interface shall be provided. It shall display settings and test values in Degrees, flow rate in Pounds Per Hou

17、r(PPH), input voltage, the scale error of the flow meter indicators of the second-harmonic type, the scale error and operation of Total Summation Indicators, output voltage of individual summation indicators, frequency and output of the flow meter power supply, test selector positions. 2.5 Tested it

18、ems: The test set shall test the following transmitters and indicators which were built according to the mil-specs: COMPONENT Military Specification Indicator, Individual Rate MIL-I-25906 Indicator, Individual Summation MIL-I-25324 MIL-I-25907 Indicator, Total Summation MIL-I-25325 MIL-I-25908 Trans

19、mitter MIL-T-8249 MIL-T-25905 Performance Specification MIL-PRF-28800 2.5.1 Testing transmitters. The test set will be testing transmitters designated type MB-2, TRU-7/A, TRU-/A. Info on such part can be found in Mil-T-8249, MIL-T-25905, and MIL-T-26298 respectively. The test set will be powered fro

20、m the aircraft through a cable from Mil Spec MS33678-14S-7P (P/N 9172332-130, Cage Code 98750) or 120V and 60Hz or 28V DC power supply. MS33678-14S-2P, 9172332-110, 98750, will be used for connection to the flow rate indicator. For bench testing, the system will use wall voltage. As the flow through

21、 the transmitter is increased and decreased by operating the engine, or through a controlled environment, the test set is used to verify that the transmitter is functioning and that the voltage output varies when the fuel flow rate changes. The test set shall have a function, XMTR that is used to ch

22、eck the operation of flow meter transmitters when installed in a flow meter system or to check transmitter accuracy when mounted on a test stand. The harmonic modulated outputs of the flow meter transmitter are demodulated by the master indicator circuit on the test set. Data is displayed in degrees

23、 to two decimal places or in pounds-per-hour for 12,000 and 15,000 PPH systems as selected by the user from the mode switch. 2.5.2 Testing indicators of the second-harmonic type. The test set will be testing indicators designated type EFU-3IA. Info on such part can be found MIL-I-25906. Provided by

24、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59928A 4 The test set will be powered from the aircraft through a cable from Mil Spec MS33678-14S-7P (P/N 9172332-130, Cage Code 98750 or wall voltage, 120V and 60Hz or 28V DC power supply) and connected throug

25、h cable 9172332-70 to the indicator and is energized with 115V, +/- 1 volt, 400 cycle single phase alternating current which shall be verified by the user on a volt meter and frequency meter. The test set shall be capable of selecting 12 K PPH or 15K PPH from a mode switch, as required by type of sy

26、stem on aircraft. The test set shall be capable of selection range 200 to 15000 PPH from the “Master Transmitter”, labeled “Master XMTR”, to test the indicator. When the indicator is checked, readings at each setting should be the same as the corresponding flow rates with tolerances +/-150 PPH. With

27、 the function switch set to INDIV ID, the master XMTR is used to check the scale error of flow meter indicators of the second harmonic type. The transmitter may be set to any desired value. Internal calibration data is sent to the indicators. Data is displayed in degrees to two decimal places or in

28、pounds-per-hour for 12,000 and 15,000 PPH systems as selected by the user. 2.5.3 Testing Individual Summation Indicators. The test set will be testing indicators designated types: Type MA-7 which provides an auxiliary summation output signal. Type MA-7A which is the same as MA-7 except it does not p

29、rovide summation output signal. Both are described in Mil-Spec MIL-I-25324. Type EFU4/A is described in MIL-I-25907. For B-52 testing, the test set will have the capability of driving eight EFU-4/A type indicators simultaneously using TBD test cable harness(s) such that the single test set generated

30、 signal can be used and read on each of the indicators simultaneously. The purpose of this test requirement is to have the ability to check the aircraft Fuel Flow Totalizer summation accuracy using inputs from one to eight indicators. For B-52 testing, the test set will have the ability to test indi

31、vidual EFU-4/A indicators either at the indicator location inside the aircraft cockpit or at the engine transmitter location outside the aircraft. The test set will be powered from the aircraft through a cable from Mil Spec MS33678-14S-7P (P/N 9172332-130 or 120V and 60Hz or 28V DC power supply and

32、9172332-190, Cage Code 98750) for connection to the flow rate indicator is energized with 115V, +/- 1 volt, 400 cycle single phase alternating current which shall be verified by the user. The test set shall be capable of selecting 12K PPH or 15K PPH from a mode switch, as required by type of system

33、on aircraft. The test set shall be capable of selection range 200 to 15000 PPH from the “Master Transmitter” to test the indicator. The Total Summation Indicator on the aircraft should display the same flow rate as the individual indicator and the test set with tolerances +/-150 PPH Provided by IHSN

34、ot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59928A 5 The linear indicator (LIN ID) position on the function switch is used to check the output voltage of individual summation indicators. The MASTER XMTR and the LINEAR XMTR PPH X 100 are used in conjunction w

35、ith the display. The MASTER XMTR is used to simulate a flow rate to the summation indicator. The LINEAR XMTR is used to null the output voltage from the summation indicator. When the summation indicator is working properly, the display should indicate near zero. A positive display indicates output o

36、f summation indicator is greater than output of the LINEAR XMTR. 2.5.4 Testing total summation indicators. The test set will be testing total summation indicators designated type MA-8, and EFU-5/A. Info on such part can be found in MIL-I-25325 and MIL-I-25908 respectively. The test set will be power

37、ed from the aircraft through a cable from Mil Spec MS33678-14S-7P (P/N 9172332-130 or 120V and 60Hz or 28V DC power supply and 9172332-50, Cage Code 98750) for connection to the flow rate indicator. With the function switch set to Total, LINEAR XMTR PPH X 100 shall be capable of transmitting flow ra

38、tes from 200 to 100,000 PPH. Indicator readings should be the same as LINEAR XMTR settings within tolerances +/-500 PPH. The LINEAR XMTR is used to check scale error and operation of Total Summation Indicators. The transmitter output is a linear voltage, 0-100 volts, which corresponds to flow rates

39、of zero to 100,000 PPH. Accuracy of the linear transmitter is +/- 0.3 volts or 300PPH. The test set will have a user selectable switch, either soft-key or hard-key, that will turn ON/OFF a 4 Hz pulse feature required to accurately simulate B-52 aircraft system functionality. This pulse feature is de

40、fined as imparting a 4 Hz 66% duty cycle modulation to the test set signal which feeds the Fuel Flow Totalizer under test. This duty cycle is further defined as being on or connected 66% of the pulse period and off or disconnected for 33% of the pulse period. When in the 33% disconnected state, the

41、physical signal wire to Pin G of the EFU-5/A Totalizer shall be open circuited and not grounded, thus accurately simulating aircraft operation. 2.5.5 Self-test. There shall be a self-test capability that tests the test sets internal circuitry and tells the user if something is wrong. The self-test s

42、hall test the 400Hz power supply to indicate rather the power supply output is correct. 2.6 AC Multi-meter. A 0-300 volt, 400Hz Multi-meter shall be connected across the switch controlled input power line. Incoming Power comes from either the aircraft power supply through the MAIN cable or from an e

43、xternal source through the 120 VOLTS 60Hz or 28V DC and GROUND terminal posts. Adjusting the line voltage can be set to 115 AC volts, 400Hz, as indicated on the VOLTS AC multi-meter, ensuring correct line voltage and frequency for the test set and component being tested. Provided by IHSNot for Resal

44、eNo reproduction or networking permitted without license from IHS-,-,-A-A-59928A 6 2.7 Function and Mode Selector. The function selector shall have the following positions: POSITION FUNCTION INDIV. IND Connects test-set MASTER TRANSMITTER, LINEAR INDICATOR, and LINEAR XMTR into circuit being tested.

45、 NULL CHECK Connects test-set LINEAR INDICATOR to grounded input discriminator circuit. TOTAL IND Connects test-set LINEAR XMTR into circuit being tested. XMTR Connects test-set MASTER INDICATOR into circuit being tested. Mode Selector: The mode selector shall have the following positions: POSITION

46、FUNCTION DEGREES Test set indicates flow rate angle 12K PPH Test set indicates flow rate of 12k flow meter system. 15KPPH Test set indicates flow rate of 15k flow meter system. A MASTER XMTR shall be capable of transmitting 0 to 15 PPH based on desired settings. A LINEAR XMTR PPH X 100 Checks scale

47、error and operation of type 8DJ72 total summation indicators. Front panel display indicators designed to present change-of-state information to the operator shall be distinguishable at a distance of 1 m in a maximum ambient light level of 100 foot-candles (fc) and a minimum light level of 1 fc. All

48、display indicators shall be discernible at viewing angles from 0 degrees to 45 degrees. 2.8 Connectors, electric. Provision shall be made to ensure that connectors will be mated only with the appropriate counterparts. Where design considerations require close proximity of connectors of similar confi

49、guration, the mating connectors shall be suitably coded or marked. The live or hot side of unmated connectors shall be protected against shorting. 2.8 Wiring, internal. Internal wiring practices shall be such that the wiring shall not be damaged during normal maintenance and calibration. 2.9 Self-test capability. The test set shall be able to provide automatic diagnostic self-test information. The infor