As a private pilot, you learn some basic lessons about planning for takeoffs and climbs designed to get your airplane up to altitude as quickly as possible, versus doing so at a more leisurely pace. In addition to certain performance requirements, such as clearing the FAA’s permanent 50-foot tree, you can also minimize noise by getting away from populated areas.
Similar concerns exist for jets and turboprops at the airlines. Most of the time, the concern is noise, but performance concerns can also exist. Two basic international standards are used, and they are established and defined by the International Civil Aviation Organization (ICAO). The first is Noise Abatement Departure Procedure (NADP) 1. Three altitudes come into play with NADP 1: 800, 1,500 and 3,000 feet above field elevation. Most of the world uses NADP 1 departure standards, all in the name of minimizing noise for people around an airport.
Pilots are expected to climb at a given speed (usually V2 plus 15 to 20 knots) to 800 feet. At 800, in the event of an engine failure, the crew will transition to flying the single-engine departure profile. Under normal circumstances, however, climb power and V2 plus 15 to 20 knots will be maintained to 1,500 feet. At 1,500 feet, power is reduced, but the reduced speed is continued. At 3,000 feet, pitch is decreased, and the flap retraction schedule begins.
During an NADP 2 procedure, the only number that counts is 800 feet. Thrust reduction, acceleration, and flap retraction all begin at 800 feet—which is still the altitude where a single-engine transition occurs.
In the United States, NADP 2 is the standard procedure. Internationally, NADP 1 is expected and even demanded. If crews fail to comply with NADP standards, the airline can face stiff fines from the local controlling agency.
As you might expect, there are some exceptions to these rules based on aircraft, engines, and terrain. In the United States, when NADP 1 is used, it’s almost always in order to meet single engine performance requirements, usually because of terrain (San Francisco is an example). In some communities, noise abatement is the issue (John Wayne Airport in Orange County is an example). Company policy can also vary, and crews will be trained accordingly.
All the performance info is calculated taking into account the airport, the runway, aircraft weight, temperature, and runway conditions. From this, the flap setting and the thrust requirements will be determined. In the most automated aircraft, the flight management system and the flight director will be working together to guide the pilot, and the autothrottles will control the thrust; otherwise, the pilot will have to make the necessary pitch and power changes.
Your company will train you on the specifics of how you will be expected to fly. This is a very brief overview as an introduction, but the need for an understanding of how it all works is critical, especially when the major concern is ensuring you have the power and terrain clearance you need in the event of a catastrophic engine failure.—Chip Wright