barfield 1811GA Series, Руководство пользователя

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Engineering Specification
Title: Airspeed, Ground Support Equipment
Barfield, Inc
4101 NW 29 Street
Miami Florida 33142
Drawing No: 23 ‐ 336 ‐ 00025 Page 2 of 5
1. Purpose:
To specify performance requirements for Pitot Static Pressure Type of Airspeed Indicators for
use in B.I.C. Manufactured ground support test equipment.
2. Scope:
This Product STANDARD SPECIFICATION covers two (2) basic types of airspeed indicators
with indication range essentially as follows:
TYPE I - 1 Revolution
TYPE II - 7 Revolutions
3. Identification:
All units regardless of origin of manufacture are to be identified by B.I.C. assigned part
numbers as follows:
B.I.C. P/N TYPE NO. RANGE
336-00001R II 50 - 650 Knots
336-00001 II 50 - 650 Knots
336-00004 I 60 - 420 Knots
336-00005 I 40 - 200 Knots
336-00006 I 20 - 250 Knots
4. Test
Conditions:
Unless otherwise specified, all tests shall be made with the instrument mounted in the
horizontal (Face UP) position.
5. Performance
Requirements:
All units are required to meet the following performance requirements before installation in any
ground support test equipment.
5.1
Friction:
The instrument shall be tested for friction at approximately four essentially equal scale
intervals. The pressure shall be brought up to the desired reading and then held
constant while two readings are taken. The first reading being taken before the
instrument is vibrated, and the second one after the instrument is vibrated. The
difference between any two readings shall not exceed any of the tolerances listed in
the calibration specifications.
5.2
Leak:
With both the pitot pressure and static pressure connections simultaneously evacuated
to 15 inches of Mercury, the leakage shall not cause more than 0.4 inch of mercury
pressure drop during a 10 second period.