De Havilland DASH8 100 Series Maintenance Manual page 42

and permits engine ignition if required. When engine speed falls (NH < 59.5 + or −
0.5%), switch (S1) closes and the Auto Relight System is enabled. Above engine idle
speed (NH > 60.8 + or − 0.5%), switch (S1) opens and igniter operation is inhibited. (Ref
Chapter 74 − Engine Ignition System.)
Do an operational test of the NH speed indicator auto relight system after replacement of
a NH speed indicator with Modsum 8Q100813 (refer to AMM 77−12−11).
MASTER
EFFECTIVITY: See Pageblock 77−12−00 page 1
D
S ERIES 100
AIRCRAFT MAINTENANCE MANUAL
77−12−00
Page 2
Jun 20/2005