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 MIL-HDBK-1023/4
Table A-5
Precision Approach Path Indicator (PAPI)/
Chase Helicopter Approach Path Indicator (CHAPI) Systems
Tolerance / limit
Parameter
Standard
Initial
Operating
1. Lamps burning
All
a. PAPI
All
Not more than one
lamp out per box
All
b. CHAPI
All
1/
2. Vertical aiming
3 30'
2 minutes
6 minutes
a. Unit D (close to runway)
b. Unit C (2nd from runway)
3 10'
2 minutes
6 minutes
2 minutes
6 minutes
c. Unit B
2 50'
2 minutes
6 minutes
d. Unit A (farthest from
2 30'
runway)
3. Horizontal alignment
degree
degree
Parallel to runway
centerline
4. Tilt switch
Same as
Same as standard
- below to + degree
standard
above established light
bar
5. Lamp current
Rated current of lamps
Same as regulator currents
(current-regulated)
for type of regulator used
3%
5%
Rated voltage of lamps
6. Lamp voltage
(voltage-regulated)
7. Obstructions due to
No obstruction
Same as
Same as standard
vegetation, etc.
standard
1/
Unless a different standard is established locally, angles shown are for a 3 degree glide path.
120
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