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NARCO AVIONICS AR850
2-2
7/03
2.2.2 Continued
1.
Connect the AR850 to the Pitot Static System Test Set. Apply
14V or 28V power and allow the system to stabilize for 5
minutes.
2.
Check pins 3, 4, 5, 9, 10, 11, 12, 13 with the ohmmeter. They
should all read a high resistance of 1 megohm or higher.
3.
Clip pin 6 to ground.
4.
Pump the AR850 to the following altitudes to check for
operation of all the code lines. An active code line will
read a low resistance of 200 ohms or lower.
USE EITHER LOWER OR HIGHER ALTITUDE TESTS
────────────────┬────┬────┬────┬─────┬────┬─────┬──────┬────
PIN NO. 2
│
3
│
4
│
5
│
9
│
10
│
11
│
12
│
13
│
│
│
│
│
│
│
│
CODE LINE A1
│
A2
│
A4
│
B1
│
B2
│
B4
│
C1
│
C4
│
C2
────────────────┼────┼────┼────┼─────┼────┼─────┼──────┼────
ALTITUDE
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
│
2400 HI
│
HI
│
HI
│
LO
│
HI
│
HI
│
LO
│
HI
│
LO
2800 HI
│
HI
│
LO
│
LO
│
HI
│
HI
│
HI
│
LO
│
HI
5500 HI
│
HI
│
LO
│
HI
│
LO
│
LO
│
HI
│
HI
│
LO
7500 HI
│
LO
│
LO
│
HI
│
HI
│
LO
│
HI
│
HI
│
LO
15500 LO
│
LO
│
HI
│
HI
│
HI
│
LO
│
HI
│
HI
│
LO
│
│
│
│
│
│
│
│
6500 HI
│
HI
│
LO
│
HI
│
HI
│
HI
│
HI
│
HI
│
LO
7300 HI
│
LO
│
LO
│
HI
│
HI
│
LO
│
LO
│
HI
│
HI
8600 HI
│
LO
│
LO
│
HI
│
LO
│
HI
│
HI
│
LO
│
LO
9500 HI
│
LO
│
LO
│
LO
│
LO
│
LO
│
HI
│
LO
│
LO
15500 LO
│
LO
│
HI
│
HI
│
HI
│
LO
│
HI
│
HI
│
LO
NOTE : LO denotes Low resistance
HI denotes High resistance
This completes the preinstallation bench check.
Содержание AR850
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