The main idea here is that RVSM altitude accuracy relies on two independent primary pressure-altitude measurement systems that are used continuously to maintain the required 1000 ft vertical separation. The standby altimeter is only a backup instrument; it isn’t part of the normal altitude-keeping loop and isn’t required to meet the same RVSM accuracy standards as the primary systems. That’s why it does not meet the RVSM accuracy requirements in the sense used for active RVSM operation. The primary altimeters are the ones that must meet the RVSM accuracy criteria, with the barometric altitude sensors providing the data to support those primaries. GPS altitude sensors are not used for RVSM altitude maintenance and are not certified to meet those barometric RVSM accuracy standards, which is why they aren’t considered meeting the requirements.

Wind shear makes takeoff performance more unpredictable and margins for safe liftoff tighter. Using fixed derates or reduced-thrust takeoffs reduces available engine power and accelerative capability when you may need maximum performance to promptly accelerate through or away from shear effects. To ensure sufficient acceleration, climb, and obstacle clearance in these conditions, the procedures prohibit fixed derate and ATM reduced-thrust takeoffs. In practice, planning is done with full takeoff thrust to maintain the required performance margins. If full thrust could not meet the required performance, the appropriate action would be to delay, but the rule for wind shear is clear: reduced-thrust options are not allowed.

A significant lateral weight imbalance creates a rolling moment and increases wing loads. To stay controllable and safe, you want to keep the aircraft’s lateral dynamics as calm as possible. Minimizing elevated load factors and roll rates directly reduces the forces and speed at which the aircraft tends to roll, helping prevent an uncontrollable roll or structural overstress caused by the imbalance. Increasing bank angle would amplify the roll tendency; maintaining maximum thrust can introduce yaw/roll coupling and uneven loading in the presence of imbalance; reducing speed lowers dynamic pressure but doesn’t address the rapid roll and load changes as effectively as limiting roll rate and load factor. So the best action is to minimize elevated load factors and roll rates.

High fuel temperature in a non-feeding tank triggers a warning at a fixed limit to protect fuel integrity and the fuel system. For this aircraft’s non-feeding tank, that limit is 60 °C. When the tank fuel reaches 60 °C, the OVHT light comes on to alert the crew to potential issues and to consider cooling or changing operating plans before relying on that tank. Temperatures below the limit won’t cause the light to illuminate, while higher values would indicate a more severe condition beyond the standard warning threshold.