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d. The OH-58D has not been tested in a cold a . Intentional f l i g h t into severe or extreme
weather environment. Until such testing is conducted, turbulence is prohibited.
the following limitations apply:
b. Intentional flight into moderate turbulence is
(1) If the free air temperature (FAT) is below -17 prohibited when the weather report or forecast is based
°C (2 °F), external power should be used for starting on fixed wing aircraft above 12,500 pounds gross
the aircraft. weight.
(2) Battery preheat or a warm battery will be used c. Intentional flight into moderate turbulence is
for all battery starts when the FAT is below -17 °C (2 permitted when the weather report or forecast is based
°F). on rotary-wing aircraft or fixed wing aircraft under
12,500 pounds gross weight.
5-18. WIND LIMITATIONS.
a. Engine starting 45 knots maximum.
b. Maximum crosswind and tailwind for hover is 35
knots, hover this may be reduced by lateral CG
5-7/(5-8 blank)
TM 1-1520-248-10
CHAPTER 6
WEIGHT/BALANCE AND LOADING
SECTION I. GENERAL
6-1. GENERAL. b. Use. Figures and tables contained in this
chapter provide weight and moment of all useful load
Sections I through V contain sufficient instructions and items. These are added to the current basic weight and
data so that the pilot, knowing the basic weight and moment to calculate the gross weight and longitudinal
moment o f t h e h e l i c o p t e r , c a n compute a n y or lateral center of gravity.
combination of weight and balance.
(1) The calculated gross weight and longitudinal
center of gravity are checked on the longitudinal
6-2. CLASSIFICATION OF HELICOPTER. center-of-gravity limits chart (fig. 6-5) to determine if
the helicopter is within gross weight and center-ofThe
OH-58D helicopter is in class 1. Additional gravity limitations.
directives governing forms and records for weight and (2) The gross weight and lateral center of gravity
balance computations on class 1 helicopters are are checked on the lateral center-of-gravity limits chart
contained in AR 95-1, TM 55-1500-342-23 and DA PAM (fig. 6-6) to determine if the helicopter is within gross
738-751. weight and center-of-gravity limitations.
(3) The effect on center of gravity by the
6-3. HELICOPTER STATION DIAGRAMS. expenditures in flight of such items as fuel, armament,
etc., may be calculated by subtracting the weight and
Helicopter compartment and station diagram (fig. 6-1) moments of the expended items. Check the new
show the helicopter reference datum lines, fuselage calculated gross weight and center of gravity on the
stations, buttlines, and waterlines. The primary purpose gross weight and center-of-gravity limitations chart.
of the figure is to aid personnel in the computation of
helicopter weight/balance and loading.
6-4. LOADING CHARTS AND TABLES.
a. Information. The loading data contained in this
chapter is intended to provide information necessary to
work loading problems.
SECTION II. WEIGHT AND BALANCE
6-5. WEIGHT AND BALANCE RECORDS. times, the last weight, moment, and cg entry is
considered the current weight and balance status of the
The weight and balance records consist of the 365 helicopter.
series forms. All these forms are maintained in the
helicopter historical record file, record of weight and
balance personnel, basic weight checklist, helicopter b. DD Form 365-4, Weight and Balance Clearance
weighing record, and basic weight and balance of Form F. The form F is used to derive the gross weight
required mission equipment installed on the helicopter. and cg of any aircraft. The form F furnishes a record of
the aircraft weight and balance status at each step of
a. DD Form 365-3, Chart C-Basic Weight and the loading process. It serves as a worksheet to record
Balance Record. The Basic Weight and Balance weight and balance calculations and any corrections
Record reflects a continuous history of the basic that must be made to ensure that the aircraft will be
weight, moment, and center of gravity (cg) resulting within weight and cg limits. Instructions for filling out
from structural and equipment changes in service. At all the form are given in TM 55-1500-342-23.
6-1
TM 1-1520-248-10
Figure 6-1. Helicopter Compartment and Station Diagram
6-2
TM 1-1520-248-10
SECTION III. FUEL/OIL
6-6. FUEL QUANTITY DATA. between lots of the same type fuel at the same
temperature by as much as 0.5 lb/gal. The following
For a given weight of fuel, there is a very small approximate fuel specific weights at 15 °C may be used
variation in fuel moment with change in fuel specific for most mission planning.
weight. Fuel moments should be determined from figure
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(57)
