NR should be pretty straight forward as per the MM by adjusting the anticipator cable and autos using the collective rigging stop bolt. If you need to double check that the NR gauge is reading correctly you can try this first.
A- PURPOSE: TO PROVIDE TWO METHODS OF CHECKING THE
ACCURACY OF THE NR-NG-NP INDICATION USING A 80 SERIES
FLUKE METER.
METHOD 1
1- PERMENANTLY SPLICE INTO THE INDICATOR WIRES BEHIND THE
DASH AS SHOWN ON THE ATTACHED DRAWING.
2- MOUNT TEST LEAD BRACKETS USING AMP TEST JACKS
AMP P/N 164-401R & 164-401B (red and black test jacks )
OR METHOD 2
3- DISCONNECT THE INDICATOR PLUG AND CONNECT THE FLUKE
METER INTO THE APPROPRIATE PINS.
4- RUN FLAT PITCH ON THE GROUND, PLUG IN THE FLUKE METER AND
READ THE FREQUENCY OF THE NR AND NG
5-USING THE ATTACHED FORMULA, DETERMINE THE NR AND NG SPEEDS
SEE ARRIEL 1D1 SERVICE LETTER (1840 / 98 / ARID / 43 )
6- TO CHECK THE FUEL CONTROL STATIC DROOP ON THE GROUND
PLOT THE NR-NG SPEEDS ON THE STATIC DROOP CHART PER THE
ENGINE MM CHAPT.73
7- TO CHECK THE NR AND NG SPEED ACCURACY IN FLIGHT,CRUISE
AT APPROX. 97% NG (B.V.CLOSED) AND TAKE THE HERTZ READINGS
AND USE THE ATTACHED FORMMULA
NR=FREQ.IN HERTZ X 2.5 = NR SPEED
NG= FREQ. IN HERTZ DIVIDED BY 140.017 X 100 = % NG
NP = FREQ. IN HERTZ DIVIDED BY 70.267 X 100 = % NP