AIM ¶ 5-6-6 — Civil Aircraft U.S. Airspace
AIM 5-6-6 explains rules for civil aircraft operating in U.S. territorial airspace, including weight thresholds, special interest countries, and TSA requirements.
AIM 5-6-6 outlines how civil aircraft may legally operate within U.S. territorial airspace, with rules that depend on aircraft weight, country of registry, and operator status.
- Light aircraft (≤100,309 lbs / 45,500 kg): May operate per all applicable regs and VFR in airport traffic patterns near the U.S. border, with limited exceptions.
- Aircraft from State Department-designated special interest countries (or using a 3LD from such a country) must follow the same rules as heavy aircraft, unless they hold valid FAA Part 129 operations specifications.
- Heavy aircraft (>100,309 lbs / 45,500 kg) must:
- File and be on an active flight plan (IFR or VFR)
- Have an operational transponder with altitude reporting and squawk an assigned code
- Have ADS-B Out where required by 14 CFR 91.225
- Maintain two-way radio communications with ATC
- If foreign-registered, operate under a TSA aviation security program or an FAA/TSA airspace waiver
- Obtain an FAA routing authorization if from a special interest country (VFR/DVFR prohibited)
An exception exists for foreign-registered aircraft on maintenance, production, or acceptance test flights when a U.S. company has operational control, an FAA-certificated PIC is flying, only crew are aboard, and "Maintenance Flight" is noted in the flight plan remarks. This guidance helps pilots and operators understand what's required before entering U.S. airspace from abroad.
Five FAA-written-style questions. Instant explanations, every answer cites its source — no account needed.
You are flying VFR in Class E airspace at 8,500 feet MSL during the day. What are your minimum visibility and cloud clearance requirements?