Nh Indication Calibration Check - De Havilland DASH8 100 Series Maintenance Manual

A
(MAGNETIC PICK−UP)
B
COIL 2
COIL 1
HIGH PRESSURE
COMPRESSOR ROTOR
SPEED (NH) SENSOR
NOTE
Circuits shown for engine no. 1.
Engine no. 2 circuits similar.
Ident code is 7711, unless
otherwise indicated.
1 PRE MOD 8−1/1101)
2
MODSUM 8Q100813.
MASTER
EFFECTIVITY: See Pageblock 77−12−11 page 201
D
S ERIES 100
AIRCRAFT MAINTENANCE MANUAL
PRESS TO TEST
PUSH BUTTON
NH SENSOR
B
P5
5V DC LIGHTING
28VDCL ESS BUS
5
ENG 1NH IND
3
ECU OUTPUT
4
2 R
1 n
5
PART OF ENG 1 HARNESS
P5 CONNECTOR
5
28VDCL SEC BUS
28VDC
TO AUTO RELIGHT
CTRL RELAY

NH INDICATION CALIBRATION CHECK

Figure 201
40 60 80
N H
20
RPM
100
0
A NH SPEED INDICATOR
P1
A
B LIGHTING GROUND
(H5)
C
POWER GROUND
D
E
F SIGNAL
G SIGNAL RETURN
H
A J HI
7700−P4
B K LO
9811−P104
RECEPTACLE L
M
1
U
N
P
HIGH PRESSURE
COMPRESSOR
ROTOR SPEED (NH)
INDICATOR
77−12−11
EXTERNALLY
REPLACEABLE
LAMPS
2 PLACES
UNLIT BLUE DOT
AT TEST VALUE
105.0% NH
OUTPUT TO
FLIGHT DATA
RECORDER
1
S1 NO
2
Page 202
Dec 20/2004