Teletype 28 - 4.21 Multiple Mounted Function Blade Contacts

SECTION 573-118-700TC
4.·21 Multiple Mounted Function Blade Contacts (For Later Design see 3. 57)
Note 1: The following adjustments should be made prior to installing the contact bracket
assembly on unit.
(A) NORMALLY OPEN CONTACT GAP
Requil ement
Min 0. 010 inch---Max 0. 020 inch
-
To Adjust
Bend stiffener.
(C) NORMALLY CLOSED CONTAC
SPRING
Requirement
Min 2-1/2 oz---Max 3-1
to move the swinger contact
away from the normally clo
contact.
To Adjust
Bend swinger contact spring
CONTACT MOUNTING BRACKET
-
c
-
/
~~'rr
-
Note 2: The following adjustments should be
made after the contact bracket assembly is
mounted on the unit.
l
..Q!J. ...0.:0..
--"'I
1--1
e
a
..._....
~
(Right Side View)
(B) NORMALLY OPEN CONTACT SPRING
Requirement
Min 3 oz---Max 4-1/2 oz -----'
to move the contact spring away
from
its stiffener.
To Adjust
Bend contact
spring. Recheck contact
gap.
LOWER CONTACT SPRING
STIFFENER
SWINGER CONTACT SP1UNG • 7 \i'E ! I I
FUNCTION BLADE
FUNCTION BLADE
SPRIN
Note 3 : Select each function blade in turn and
determine that there is a definite transfer from
mak~ to break contacts. Refine adjustment (D).
Page 176
176
Pages
(Right Side View)
(D) NORMALLY CLOSED CONTACT GAP
Requirement
With function blade in the nonselect
position and the function blade lifter
in its lowest position ,
~-.. ___ Min 0. 010 inch---Max 0. 020 inch f'
To Adjust
Bend
lower contact spring.
1!$, FAA AC '14-8131