S-61R Pelican/Limits

1 Limits

1.1 General

1.1.1 Purpose

This chapter identifies the operating limitations that should be observed by the flight crew during operation of this helicopter.

1.1.2 Minimum Crew

The minimum crew required to operate this helicopter is two pilots and a flight engineer. However, in the event the two other avatars cannot be located, a waiver for single-pilot flight is granted.

1.2 System Limits

1.2.1 Instrument Markings

All instrument markings should be observed while flying this helicopter.

• Lower Red Radial - The red radial having the lowest numerical value on an instrument indicates that a dangerous condition would exist if the pointer should drop to or below that value during flight.
• Yellow Arc or Radial - A yellow arc or radial indicates that danger may exist under certain specified conditions. Operation in these regions may only be carried out in accordance with the limitations prescribed in this manual.
• Green Arc - A green arc indicates the region for continuous inflight operation.
• Upper Red Radial - The red radial having the highest numerical value on an instrument indicates that a dangerous condition would exist if the pointer should reach this value and that operation above this point is prohibited.

1.2.2 Rotor Limits

Rotor speed should be between 91 percent and 112 percent in normal operation. Rotor speed excursions above 115 percent require a tear-down inspection of the rotor system.

1.3 Loading Limits

1.3.1 Center-of-Gravity Limitations

See Fig. 6-1 for center-of-gravity limitations with respect to gross weight.

1.3.2 Maximum Gross Weight

The maximum gross weight is 22,050 pounds.

1.3.3 Cargo Hook Limitations

Maximum weight for external cargo is 8,000 pounds.

1.4 AIRSPEED LIMITATIONS

1.4.1 Maximum forward speed

• Maximum airspeed at design gross weight of 19500 pounds, for sea level, standard day conditions, is 142 knots IAS. Maximum airspeed at maximum gross weight of 22050 pounds for sea level, standard day conditions is 138 knots.
• With an external load, the maximum forward airspeed is 120 knots.
• Maximum speed while operating the windshield wipers is 130 knots.
• Maximum Speed while operating the aft ramp is 115 knots.
• Maximum Speed while operating the personnel door is 115 knots.

1.4.2 Other Speed Limitations

Maximum airspeed in sideward flight is 35 knots. Maximum airspeed in rearward flight is 30 knots. Maximum crosswind or tailwind in a hover is 45 knots.

1.5 MANEUVERING LIMITS

1.5.1 Aerobatics

Acrobatic maneuvers are prohibited with this helicopter.

1.5.2 Bank Limitations

Bank angles are limited to 45 degrees.

1.5.3 Landing Limitations

1. The maximum rate of descent at touchdown for gross weights up to 19,500 pounds is 480 feet/min.
2. The maximum rate of descent at touchdown for gross weights above 19,500 pounds is 360 feet/min.
3. The maximum groundspeed for running landings is 60 knots.
4. The maxmum nose-up attiude for landings is 20 degrees.

1.6 Servicing

1.6.1 Fuel

1.6.1.1 Fuel Types

Usage	Fuel Type	Restrictions
Normal	JP-5	Unlimited Use
	Jet-A/Jet-A1	Unlimited Use
Emergency	100LL	Limited to 2 Hours Total Flight time. Tear Down Inspection of Engines and Fuel System required after any use.

1.6.1.2 Fuel Capacities

Tank	Capacity	Feeds
Forward Tank	348 gal.	Feeds #1 engine
Aft Tank	345 gal.	Feeds #2 engine
Forward Aux Tank	184 gal.	Feeds Forward and Aft tanks
Aft Aux Tank	245 gal.	Feeds Aft Tank

1.6.2 Fluid Types

Only genuine Shergood oil and hydraulic fluid products should be used in servicing this helicopter.

1.6.3 Fluid Capacities

Fluid	Capacity
Engine #1 Oil	10 qt.
Engine #2 Oil	10 qt.
Main Transmission	44 qt.
Intermediate Gear box	0.8 qt.
T/R Transmission	1.6 qt.
Primary Servo Hydraulic	1.8 qt.
Auxiliary Servo Hydraulic	1.8 qt.
Utility Hydraulic	5.04 qt.