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peak TGT.
16. ENGINE TRQ Peak engine torque (ENG TRQ) is displayed as a percentage. No limit needs
to be exceeded for ENG TRQ to be displayed.
17. MAST TRQ Peak engine torque (MAST TRQ) is displayed as a percentage. No limit
needs to be exceeded for MAST TRQ to be displayed.
18. TGT RUN Maximum TGT during post-start running conditions is displayed in degrees
Celsius. No limit needs to be exceeded for TGT RUN to be displayed.
19. TGT START Maximum TGT during an engine start is displayed in degrees Celsius. No
limit needs to be exceeded for TGT START to be displayed.
Figure 3-55. (CDS2) ENGINE HISTORY Page 2 (Sheet 2 of 2)
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TM 1-1520-248-10
SECTION VI. ENGINE HISTORY PAGES
3-82. ENGINE HISTORY PAGES. the text ENGINE HISTORY. An exit to the FDL MENU
is made by pressing the mode select button labeled
ENGINE HISTORY Pages (Fig. 3-56, Fig. 3-57, and MENU or the INIT button on the MFD auxiliary control
Fig. 3-58) display maximum engine values, trend data, panels.
and other engine data such as the number of engine
starts while the helicopter is on the ground. This data is a. ENGINE HISTORY Page 1. Output trend and
gathered from engine start to shutdown, and is peak value data are displayed to provide engine
periodically stored in Non-Volatile Memory (NVM). The performance trends. The date of the LAST RESET
ENGINE HISTORY data is maintained until specifically (cleared) is also shown.
cleared. The data is cleared by maintenance personnel
entering specific codes identified by unit SOP. b. ENGINE HISTORY Page 2. This page lists items
The ENGINE HISTORY Page(s) are accessed from the that have exceeded limits.
FDL MENU Page by pressing L-4. The ENGINE
HISTORY display consists of three pages. Pressing R-5 c. ENGINE HISTORY Page 3. This page lists
key on any of the pages selects the next page. The FADEC HISTORY, MAINTENANCE CODES, and
page number is shown at the top of the display after MODIFY ENG STARTS.
3-109
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. (CDS3) LCF 2 LCF 2 displays number of times NG has traversed range of 85% NG to 95%
NG.
2. NG Peak turbine gas generator speed (NG) is displayed as a percentage. No
limit need to exceeded for NG to be displayed.
3. NP Peak power turbine speed (NP) is displayed as a percentage, if limit
exceeded.
4. NR Peak main rotor speed (NR) is displayed as a percentage.
5. ENG TRQ Peak engine torque (ENG TRQ) is displayed as a percentage. No limit need
be exceeded for ENG TRQ to display.
6. MAST TRQ Peak mast torque (MAST TRQ) is displayed as a percentage. No limits need
be exceeded for MAST TRQ to display.
7. TGT RUN Maximum TGT during post-start running conditions is displayed in degrees
Celsius. No limit need be exceeded for TGT RUN to display.
8. TGT START Maximum TGT during engine start is displayed in degrees Celsius. No limit
need be exceeded for TGT START to display.
Figure 3-56. ENGINE HISTORY Page 1 (Sheet 1 of 2)
3-110
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
9. LAST RESET The code that the last engine history reset (clear) was performed is
displayed.
10. COAST DOWN The 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%
11. (CDS3) LCF 1 Low cycle fatigue (LCF) 1 displays the number of times NG has traversed
the range of 50% NG to 95% NG.
Figure 3-56. ENGINE HISTORY Page 1 (Sheet 2 of 2)
3-111
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
CONTROL/INDICATOR FUNCTION
1. TGT 12 SEC LIMIT If TGT exceeds 802 °C for 12 seconds, a counter increments by one. Total
count is displayed.
2. TGT 30 MIN LIMIT If TGT has exceeded 716 °C for more than 30 consecutive minutes, a
counter increments by one. Total count is displayed.
3. NG 10 SEC LIMIT Each time NG exceeds 105% for 10 seconds, a counter increments by one.
Total count is displayed.
4. NP 15 SEC LIMIT Each time NP exceeds the lower variable limit for 15 seconds, a counter
increments by one. Total count is displayed.
5. QE 2 SEC LIMIT Each time QE exceeds 121.6% for 2 seconds, a counter increments by one.
Total count is displayed.
6. QE 10 SEC LIMIT Each time QE exceeds 112.6% for 10 seconds, a counter increments by
one. Total count is displayed.
7. QM > 150% Each time QM exceeds 150% a counter increments by one. Total count is
displayed for life of transmission.
Figure 3-57. ENGINE HISTORY Page 2 (Sheet 1 of 2)
3-112
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
8. QM > 125% Each time QM exceeds 125% a counter increments by one. Total count is
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TECHNICAL MANUAL OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPT(87)
