Chapter 5 - System Limits Flashcards
NR
POWER ON
TRANSIENT ___ - ___%
CONTINUOUS ___ - ___%
TRANSIENT ___ - ___%
POWER OFF (AUTOROTATION)
MAXIMUM ___%
TRANSIENT ___ - ___%
NORMAL ___ - ___%
UPPER RED RANGE BEGINS AT ___% TO CORRESPOND WITH THE POWER OFF LIMIT
NR
POWER ON
TRANSIENT 101 - 107%
CONTINUOUS 95 - 101%
TRANSIENT 91 - 95%
POWER OFF (AUTOROTATION)
MAXIMUM 110%
TRANSIENT 105 - 110%
NORMAL 90 - 105%
UPPER RED RANGE BEGINS AT 110% TO CORRESPOND WITH THE POWER OFF LIMIT
NP1/NP2
12 - SECOND TRANSIENT ___ - ___%
TRANSIENT ___ - ___%
CONTINUOUS ___ - ___%
TRANSIENT ___ - ___%
12 - SECOND TRANSIENT 105 - 107%
TRANSIENT 101 - 105%
CONTINUOUS 95 - 101%
TRANSIENT 91 - 95%
NG
12 SECOND TRANSIENT ___ - ___%
CONTINUOUS ___ - ___%
12 SECOND TRANSIENT 105 - 106%
CONTINUOUS 0 - 105%
TORQUE (Q)
10 SECOND TRANSIENT DUAL - ENGINE ABOVE 80 KIAS \_\_\_ - \_\_\_% 80 KIAS OR BELOW \_\_\_ - \_\_\_% SINGLE - ENGINE \_\_\_ - \_\_\_%
CONTINUOUS DUAL - ENGINE ABOVE 80 KIAS \_\_\_ - \_\_\_% AT OR BELOW 80 KIAS \_\_\_ - \_\_\_% SINGLE - ENGINE \_\_\_ - \_\_\_%
10 SECOND TRANSIENT DUAL - ENGINE ABOVE 80 KIAS 100 - 144% 80 KIAS OR BELOW 120 - 144% SINGLE - ENGINE 135 - 144%
CONTINUOUS DUAL - ENGINE ABOVE 80 KIAS 0 - 100% AT OR BELOW 80 KIAS 0 - 120% SINGLE - ENGINE 0 - 135%
TGT
12 SECOND TRANSIENT \_\_\_ - \_\_\_C 2.5 MINUTE TRANSIENT (CONTINGENCY POWER) \_\_\_ - \_\_\_C START ABORT LIMIT \_\_\_C 10 MINUTE LIMIT \_\_\_ - \_\_\_C 30 MINUTE LIMIT \_\_\_- \_\_\_C NORMAL \_\_\_ - \_\_\_C
NOTE:
ON THE POWER POD TGT IS NOT DISPLAYED UNLESS ABOVE 793C
12 SECOND TRANSIENT 903 - 949C 2.5 MINUTE TRANSIENT (CONTINGENCY POWER) 879 - 903C START ABORT LIMIT 851C 10 MINUTE LIMIT 846 - 879C 30 MINUTE LIMIT793- 846C NORMAL 0 - 793C
NOTE:
ON THE POWER POD TGT IS NOT DISPLAYED UNLESS ABOVE 793C
ENGINE OIL TEMPERATURE
30 MINUTE LIMIT ___ - ___C
CONTINUOUS ___ - ___C
30 MINUTE LIMIT 135 - 150C
CONTINUOUS -20 - 135C
ENGINE OIL PRESSURE
5 MINUTE LIMIT ___ - ___PSI
NORMAL ___ - ___PSI
IDLE ___ - ___PSI
5 MINUTE LIMIT 100-120PSI
NORMAL 26 - 100PSI
IDLE 22 - 26PSI
TRANSMISSION OIL TEMPERATURE
PRECAUTIONARY ___ - ___C
CONTINUOUS ___ - ___C
PRECAUTIONARY 105 - 140C
CONTINUOUS -20 - 105C
TRANSMISSION OIL PRESSURE
PRECAUTIONARY __ - __PSI
CONTINUOUS __ - __PSI
IDLE AND TRANSIENT __ - __PSI
PRECAUTIONARY 65 - 130PSI
CONTINUOUS 30 - 65PSI
IDLE AND TRANSIENT 20 - 30PSI
ROTOR BRAKE AND GUST LOCK OPERATIONS
Operating an engine against the gust lock is __________ on rotor brake equipped helicopters.
Rotor brake shall not be applied with engine(s) operating and rotor turning except during an emergency stop. Maximum rotor speed for _________ rotor brake applications is ___% NR.
Routine stops will be with engine(s) off, NR below ___% and with ____-___ psi applied to stop the rotor in not less than ____ seconds.
Minimum rotor brake pressure for engine start is ____ psi. Maximum rotor brake pressure for engine start is ____ psi.
Use of the rotor brake with engine(s) operating is _________ to single and dual engine starts and operations at _____ only.
Single and dual engine starts and operation at ______ with rotor brake on are not time limited.
Operating an engine against the gust lock is prohibited on rotor brake equipped helicopters.
Rotor brake shall not be applied with engine(s) operating and rotor turning except during an emergency stop. Maximum rotor speed for emergency rotor brake ap-plications is 76% NR.
Routine stops will be with engine(s) off, NR below 40% and with 150-180 psi applied to stop the rotor in not less than 12 seconds.
Minimum rotor brake pressure for engine start is 450 psi. Maximum rotor brake pressure for engine start is 690 psi.
Use of the rotor brake with engine(s) operating is restricted to single and dual engine starts and operations at IDLE only.
Single and dual engine starts and operation at IDLE with rotor brake on are not time limited.
5.10.2 Engine NP Limitations.
Transient NP1 or NP2 operation in yellow range (____% to ____%) is not recommended as good operating practice. However, no damage to either engine or drive train is incurred by operation within this range. Momentary transients above ____% NP are authorized for use by maintenance test pilots during autorotational rpm checks.
Transient NP1 or NP2 operation in yellow range (101% to 105%) is not recommended as good operating practice. However, no damage to either engine or drive train is incurred by operation within this range. Momentary transients above 107% NP are authorized for use by maintenance test pilots during autorotational rpm checks.
- 10.3 Engine Starter Limits.
b. At ambient temperatures of ____°C (59°F) and below, ____ consecutive start cycles may be made, followed by a ____ minute rest period, followed by ____ additional consecutive start cycles. A ____ minute rest period is then required before any additional starts.
c. At ambient temperatures above ____° up to ____°C (59° up to 126°F), ____ consecutive start cycles may be made. A ____ minute rest period is then required before any additional start cycles.
b. At ambient temperatures of 15°C (59°F) and below, two consecutive start cycles may be made, followed by a 3 minute rest period, followed by two additional consecutive start cycles. A 30 minute rest period is then required before any additional starts.
c. At ambient temperatures above 15° up to 52°C (59° up to 126°F), two consecutive start cycles may be made. A 30 minute rest period is then required before any additional start cycles.
5.11 PNEUMATIC SOURCE INLET LIMITS.
The minimum ground-air source (pneumatic) required to start the helicopter engines is ____ psig and ____ ppm at ____°C (300°F). The maximum ground-air source to be applied to the helicopter is ____ psig at ____°C (480°F), measured at the external air connector on the fuselage.
The minimum ground-air source (pneumatic) required to start the helicopter engines is 40 psig and 30 ppm at 149°C (300°F). The maximum ground-air source to be applied to the helicopter is 50 psig at 249°C (480°F), measured at the external air connector on the fuselage.
5.12 ENGINE START LIMITS.
CAUTION
Engine start attempts at or above a pressure altitude of 18,000 feet could result in a hot start.
Crossbleed starts shall not be attempted unless the ______________________________________ advisory does not appear, and operating engine must be at ____% NG or above and rotor speed at ___% NR.
CAUTION
Engine start attempts at or above a pres-sure altitude of 18,000 feet could result in a hot start.
Crossbleed starts shall not be attempted unless the ENG 1 ANTI-ICE ON or ENG 2 ANTI-ICE ON advisory does not appear, and operating engine must be at 90% NG or above and rotor speed at 100% NR.
5.16 WEIGHT LIMITATIONS.
HELICOPTER MAXIMUM WEIGHT
UH-60M _____ lbs
UH-60M external lift mission _____ lbs
ESSS/ERFS helicopter on ferry mission (Airworthiness release required) ______ lbs
External lift missions above _____ pounds can only be flown with cargo hook loads above _____ pounds and up to _____ pounds.
Maximum weight is further limited by cargo floor maximum capacity of ______ pounds per square foot.
HELICOPTER MAXIMUM WEIGHT
UH-60M 22,000 lbs
UH-60M external lift mission 23,500 lbs
ESSS/ERFS helicopter on ferry mission (Airworthiness release required) 24,500 lbs
External lift missions above 22,000 pounds can only be flown with cargo hook loads above 8,000 pounds and up to 9,000 pounds.
Maximum weight is further limited by cargo floor maximum capacity of 300 pounds per square foot.
