Numbers to Memorize
Every FAA Part 107 number that shows up on the knowledge test, in one place. Each row cites its source in small print — if you can't find a number here, it isn't verified and shouldn't be memorized as fact.
Operating limits
| Groundspeed | 87 knots (100 mph) maximum |
|---|---|
| Altitude | 400 ft. AGL max, or within 400 ft. of a structure and no higher than 400 ft. above its uppermost point |
| Flight visibility | 3 statute miles minimum |
| Cloud clearance | 500 ft. below / 2,000 ft. horizontally minimum |
14-cfr-107.txt, § 107.51.
Aircraft weight
| Max takeoff weight | Less than 55 lb., including everything attached to the aircraft |
|---|
14-cfr-107.txt, §§ 107.1, 107.3.
Night & twilight lighting
| Anti-collision lighting | Visible for at least 3 statute miles |
|---|---|
| Civil twilight window | 30 min. before sunrise to sunrise; sunset to 30 min. after sunset |
14-cfr-107.txt, § 107.29.
Accident & safety reporting
| Report to FAA within | 10 calendar days |
|---|---|
| Property-damage threshold | Exceeds $500 in repair cost or fair market value |
14-cfr-107.txt, § 107.9.
Certification, recency & retesting
| Knowledge recency | Required every 24 calendar months |
|---|---|
| Failed-test retest wait | 14 calendar days |
| Alcohol/drug denial period | Up to 1 year |
14-cfr-107.txt, §§ 107.65, 107.57, 107.59.
Remote ID broadcast accuracy
| Aircraft/control-station position | Within 100 ft. (95% probability) |
|---|---|
| Control-station altitude | Within 15 ft. |
| Aircraft altitude | Within 150 ft. |
| Broadcast latency | Under 1.0 second |
| Minimum broadcast rate | 1 message per second |
14-cfr-89.txt, § 89.310(h).
FRIA validity
| Approval period | 48 calendar months |
|---|---|
| Renewal request deadline | At least 120 days before expiration |
14-cfr-89.txt, § 89.225.
Test structure & scoring
| Scored questions | 60 |
|---|---|
| Unscored validation questions | 5 (not identifiable, don’t skip any) |
| Time allotted | 120 minutes |
| Passing score | 70% — 42 of 60 correct |
UAG_Information_Bulletin.pdf, p. 4.
Current exam weighting (effective 2025-09-29)
| Regulations (UA.I) | 48% |
|---|---|
| Airspace (UA.II) | 20% |
| Weather (UA.III) | 5% |
| Loading and performance (UA.IV) | 2% |
| Operations (UA.V) | 25% |
UAG_Information_Bulletin.pdf, p. 4 — never the retired FAA-S-ACS-10B blueprint appendix.
Most-missed knowledge code
| UA.I.E.K13 — Declaration of Compliance | 78.58% missed (2nd Qtr. CY25) |
|---|
frequently_missed_acs_codes_fy_2025_2q.pdf, p. 1.
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