Noise Abatement Climb Calculator
Calculate NADP 1 and NADP 2 departure profiles for noise compliance.
NADP Comparison
| Parameter | NADP 1 | NADP 2 |
|---|---|---|
| Focus | Close-in noise | Distant noise |
| Thrust Reduction | 800-1000 ft | 800-1500 ft |
| Flap Retraction | After accel | At 1000+ ft |
| Acceleration | At 3000+ ft | Early (1000 ft) |
| Best For | Areas < 3 nm | Areas > 3 nm |
Key Points
- Minimum thrust reduction: 800 ft AGL (ICAO)
- Maintain V2+10 to 20 kt minimum initial
- Climb gradient must meet SID requirements
- Check airport-specific procedures
Understanding NADP Procedures
NADP 1 - Close-in Noise Abatement
NADP 1 is designed to reduce noise close to the airport. The aircraft climbs at V2+10-20 to an acceleration altitude (typically 3000 ft), then accelerates while retracting flaps. Thrust is reduced at the minimum safe altitude (800-1000 ft). This keeps the aircraft higher over close-in communities but may increase noise at distant points.
NADP 2 - Distant Noise Abatement
NADP 2 reduces noise at greater distances from the airport. After thrust reduction at 800-1500 ft, the aircraft accelerates early and retracts flaps at lower altitude. This produces a flatter, faster climb profile that reduces noise footprint at distant communities but may increase close-in noise.
ICAO Guidelines
- Thrust reduction: not below 800 ft AGL
- Initial climb: V2+10 to V2+20
- Both procedures must ensure obstacle clearance
- Engine-out capability must be maintained
- Local procedures may vary - check NOTAMs