(a) "Effective length" of runway required when effective length is determined in accordance with § 42.1 (a) (12) with zero wind and zero gradient.

1 Steady approach speed through 50 feet height knots TIAS denoted by symbol V50. 2 Limited by § 42.82.

(b) Actual length of runway required when effective length, considering obstacles, is not determined in accordance with § 42.1 (a) (12).

1 Steady approach speed through 50 feet height-knots TIAS denoted by symbol V50. 2 Limited by § 42.82.