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on the ground. This data is gathered from engine start panels.
to shutdown and is periodically stored in Non-Volatile
Memory (NVM). The ENGINE HISTORY data is
maintained until specifically cleared. The data is a. ENGINE HISTORY Page 1. This page lists data
cleared by maintenance personnel entering specific collected during the HIT check and output trend data.
codes identified by unit SOP.
The ENGINE HISTORY Page(s) are accessed from the b. ENGINE HISTORY Page 2. This page lists peak
FDL MENU Page by pressing L-3. The ENGINE values and limits exceeded.
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TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
CONTROL/INDICATOR FUNCTION
1. PRESS ALT During HIT check, ambient pressure altitude is displayed in feet.
2. ENG TRQ During HIT check, average engine torque (ENG TRQ) is displayed as a
percentage.
3. NP During HIT check, average power turbine speed (NP) is displayed as a
percentage.
4. TGT C Corrected TGT during HIT check is displayed in degrees Celsius.
5. LCF 2 Displays number of times NG has traversed the range of 85% NG to 95%
NG.
6. ENG HRS Total engine running time is displayed in hours and tenths of hours.
7. LAST RESET The date/code that the last ENGINE HISTORY reset (clear) was performed
is displayed.
8. COAST DOWN Time taken for the engine to slow to a stop is recorded. The engine must be
shut down and the aircraft must be on the ground. Time is recorded in
seconds while NG goes from 30% to 10%.
Figure 3-54. (CDS2) ENGINE HISTORY Page 1 (Sheet 1 of 2)
3-105
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
9. HSF Hot section factor (HSF) displays a count which is a function of time and
turbine gas temperature (TGT). The number of counts per second increases
as TGT increases.
10. LCF 1 Low cycle fatigue (LCF) 1 displays number of times NG has traversed the
range of 50% NG to 95% NG.
11. HIT The result of HIT check is displayed as a percentage.
12. NG During HIT check, average turbine gas generator speed (NG) is displayed as
a percentage.
13. TGT During HIT check, average turbine gas temperature (TGT) is displayed in
degrees Celsius.
14. OAT During HIT check, outside air (ambient) temperature is displayed in degrees
Celsius.
Figure 3-54. (CDS2) ENGINE HISTORY Page 1 (Sheet 2 of 2)
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TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
CONTROL/INDICATOR FUNCTION
1. NG Peak turbine gas generator speed (NG) is displayed as a percentage. No
limit needs to be exceeded for NG to be displayed.
2. NP Peak power turbine speed (NP) is displayed as a percentage. No limit needs
to be exceeded for a percentage to be displayed.
3. NR Peak main rotor speed (NR) is displayed as a percentage.
4. MAST TRQ If mast torque (MST TRQ) exceeds 100%, the peak value is displayed. The
CDS records time spent in each of five overtorque segments. Time is
displayed for the segment in which the peak value appears.
5. ENG TRQ 10 SEC Each time ENG TRQ exceeds 112.6% for 10 seconds, a counter increments
LIMIT by one. Total count is displayed.
6. ENG TRQ 2 SEC LIMIT Each time ENG TRQ exceeds 121.6% for 2 seconds, a counter increments
by one. Total count is displayed.
7. ENG TRQ>131% If engine torque (ENG TRQ) exceeds 131%, time above the limit is displayed
along with peak ENG TRQ.
Figure 3-55. (CDS2) ENGINE HISTORY Page 2 (Sheet 1 of 2)
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TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
8. NP 10 SEC LIMIT Each time NP exceeds the lower variable limit for 10 seconds, a counter
increments by one. Total count is displayed.
9. NP>MAX Two setpoint limits for power turbine speed (NP) vary according to engine
torque. Normal operating conditions for NP are below both limits. If both
limits are exceeded, time above the lower limit is displayed along with the
NP percentage above the upper limit.
10. NG 10 SEC LIMIT Each time NG exceeds 105% for 10 seconds, a counter increments by one.
Total count is displayed.
11. NG>106 If turbine gas generator speed (NG) exceeds 106%, time above that limit is
displayed along with peak NG.
12. TGT 30 MIN LIMIT If TGT exceeds 716 °C for more than 30 consecutive minutes, a counter
increments by one. Total count is displayed.
13. TGT 5 MIN LIMIT If TGT exceeds 785 °C for 5 consecutive minutes, a counter increments by
one. Total count is displayed.
14. TGT 10 SEC LIMIT If TGT exceeds 802 °C for 10 seconds, a counter increments by one. Total
count is displayed.
15. TGT>871C If TGT exceeds 871 °C, time above that limit is displayed along with the
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(86)
