description and operation
1. GENERAL
Add the model 551RL Servo Amplifier -Indicator to this list.
C. (2)
DESCRIPTION OF COMPONENTS (See figure l.A, attached)2,
C. SERVO AMPLIFIER -INDICATOR
The model 551RL is similar to and interchangeable with the model
551A. The primary difference is that the 551RL contains arotat¬
able azimuth card and internal blue -white lighting. See installation
manual I. B. 2012.
(1 )
3 . O U T L I N E D I M E N S I O N S A N D W E I G H T
B. (2)The weight of the 551RL is 1.7 lbs.
O P E R AT I N G C O N T R O L S A N D T H E I R F U N C T I O N6.
The azimuth control knob on the 551 RL is mechanically linked to the azimuth
card. This allows 360 degree rotation of the card.
M A I N T E N A N C E P R A C T I C E S
DISASSEMBLY PROCEDURE: SERVO AMPLIFIER-INDICATOR (See figure 303).5.
The procedure for the 551RL is similiar, however for lens or lamp replacement
proceed as follows:
(a)Remove azimuth control knob.
(b)Remove three screws on face of instrument and lift
off the retaining mask assembly.
(c)Remove four small screws holding the indice plate
on the rear of the retaining mask assembly.
(d)Lift off the indice plate and contact ring assembly.
(e)The indicator lamps are mounted on the contact ring
assembly.
B e n d i x A v i o n i c s D i v i s i o n
I. B. 2012A 969
Supplement No. 1
1of 7
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General