Extract from the T-28B/C manual.
ACCELERATION LIMITATIONS
The maximum permissible accelerations for flight in smooth air, at weights of 8050 pounds or less, are shown in figure 1-27. Accelerations at which buffeting is encountered shall not be exceeded. When flying in conditions of moderate turbulence, it is essential that accelerations, because of deliberate maneuvers, be limited to 4 g’s, at a gross weight of 8050 pounds, in order to minimise the possibility of overstress as a result of the combined effects of gusts and maneuvering loads. As gross weights are increased above 8050 pounds, the permissible accelerations decrease. To determine the maximum permissible accelerations at gross weights in excess of 8050 pounds, multiply the accelerations shown in figure 1-27 for smooth air or that given for moderate turbulence by the ratio of 8050 pounds to the new gross weight.
On aircraft equipped with strakes, the maximum permissible acceleration is 5.7 g’s when carrying stores. However, when stores are carried in turbulent air, the maximum permissible acceleration is 3.7 g’s. This limit is necessary so that the 5.7 g limit will not be exceeded when severe gusts are encountered.
Because rolling pullouts impose additional stress, maximum permissible acceleration is two-thirds the maximum permissible acceleration for a normal pullout.
At indicated airspeeds between 170 and 185 knots, critical combinations of acceleration and buffet can cause overstress. In the clean configuration, the maximum permissible acceleration for flights in smooth air (dynamic stall line) is 5 g’s at 170 knots IAS and 6 g’s at 210 knots IAS, varying linearly from 170 to 210 knots as shown in figure 1-27. Stick back pressure should be relaxed at the onset of buffet in the 170 to 210 knot speed range.
When carrying stores, the maximum permissible acceleration is 6.0 g’s (5.7 g’s on T-28C). Maximum permissible accelerations for modified T-28C aircraft are shown in figure 1-28. However, when stores are carried in turbulent air, the maximum permissible acceleration is reduced by 2 g’s. This limit is necessary so that the maximum g limit will not be exceeded when severe gusts are encountered.
ARMAMENT (MODIFIED T-28C)
1. On modified T-28C aircraft with six store stations, figure 1-28 establishes maximum permissible accelerations for symmetrically loaded store configurations at 2500 feet or less at a maximum speed of 295 knots in smooth air. However, when stores are carried in turbulent air, reduce the maximum acceleration shown in figure 1-28 by 2 g’s.
2. The maximum permissible acceleration for store loadings heavier than 100 pounds asymmetrically is 3.2 g’s at 9500 pounds gross weight or greater and 3.7 at less than 9500 pounds gross weight.
3. Rolling pullouts for all configurations may be performed at two-thirds the symmetrical limits. Lateral stick deflections are limited to half throw when stores over 250 pounds are carried at stations 2 and 5.
4. High sink speed landings are prohibited for all store configurations other than 150 pounds maximum at store stations 3 and 4.
