Federal Aviation Administration (FAA)
1,543,725Words in 92 parts
14.0Restriction density (per 1,000 words)
18.7Reading grade
45.2%Unchanged since 2017
4Flagged parts
2026-09-29Last change
Section changes per year
From the eCFR versioner, for the parts that the agency owns now. Before 2017 is the baseline load.
Text and size
- Sentences
- 33.8 words on average; 28.0% over 40 words; 32.8% passive; 13.5 cross-references per 1,000 words
- Sentence types
- definition 5.5% · prohibition 4.5% · paperwork 5.8% · obligation 27.7% · permission 8.9% · other 47.6%
- Checksum
e3fd8f87e6840f77b4677a4f21dd20325a2a6e3fb02c978351068233e71a00b1
Review candidates in this agency
| Rank | Part | Words | Score |
|---|---|---|---|
| 259 top 10% | 14 CFR 29
AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT
High signals: Restriction density
+2.1 SD · Size
+2.1 SD · Directive share
+1.5 SD |
70,315 | 0.92 |
| 337 top 10% | 14 CFR 68
REQUIREMENTS FOR OPERATING CERTAIN SMALL AIRCRAFT WITHOUT A MEDICAL CERTIFICATE
High signals: Reading grade
+5.2 SD · Directive share
+1.1 SD |
2,067 | 0.86 |
| 354 top 10% | 14 CFR 25
AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
High signals: Size
+2.8 SD · Restriction density
+1.7 SD · Directive share
+1.2 SD |
149,067 | 0.84 |
| 417 top 10% | 14 CFR 27
AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT
High signals: Restriction density
+1.9 SD · Size
+1.9 SD · Directive share
+1.4 SD |
53,167 | 0.80 |
| 708 | 14 CFR 14
RULES IMPLEMENTING THE EQUAL ACCESS TO JUSTICE ACT OF 1980
High signals: Paperwork share
+2.0 SD · Directive share
+1.0 SD |
3,976 | 0.68 |
| 776 | 14 CFR 33
AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES
High signals: Restriction density
+1.5 SD · Size
+1.3 SD · Directive share
+1.3 SD |
28,407 | 0.65 |
| 783 | 14 CFR 61
CERTIFICATION: PILOTS, FLIGHT INSTRUCTORS, AND GROUND INSTRUCTORS
High signals: Size
+2.3 SD · Reading grade
+1.8 SD |
89,442 | 0.65 |
| 838 | 14 CFR 111
PILOT RECORDS DATABASE
High signals: Paperwork share
+3.0 SD |
7,173 | 0.62 |
| 879 | 14 CFR 91
GENERAL OPERATING AND FLIGHT RULES
High signals: Size
+2.5 SD |
106,797 | 0.60 |
| 1,088 | 14 CFR 145
REPAIR STATIONS
High signals: Directive share
+1.3 SD · Restriction density
+1.2 SD · Paperwork share
+1.1 SD |
7,788 | 0.53 |
| 1,188 | 14 CFR 31
AIRWORTHINESS STANDARDS: MANNED FREE BALLOONS
High signals: Restriction density
+2.8 SD · Directive share
+1.6 SD |
4,470 | 0.51 |
| 1,242 | 14 CFR 121
OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
High signals: Size
+2.7 SD |
143,177 | 0.49 |
| 1,255 | 14 CFR 35
AIRWORTHINESS STANDARDS: PROPELLERS
High signals: Restriction density
+2.2 SD · Directive share
+1.6 SD |
4,806 | 0.48 |
| 1,277 | 14 CFR 135
OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
High signals: Size
+2.3 SD · Directive share
+1.1 SD |
85,412 | 0.48 |
| 1,338 | 14 CFR 36
NOISE STANDARDS: AIRCRAFT TYPE AND AIRWORTHINESS CERTIFICATION
High signals: Size
+1.7 SD |
45,414 | 0.46 |
| 1,371 | 14 CFR 125
CERTIFICATION AND OPERATIONS: AIRCRAFT HAVING A SEATING CAPACITY OF 20 OR MORE PASSENGERS OR A MAXIMUM PAYLOAD CAPACITY OF 6,000 POUNDS OR MORE; AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT
High signals: Size
+1.7 SD · Directive share
+1.3 SD |
41,571 | 0.45 |
| 1,575 | 14 CFR 142
TRAINING CENTERS
High signals: Reading grade
+1.8 SD |
7,431 | 0.39 |
| 1,692 | 14 CFR 47
AIRCRAFT REGISTRATION
High signals: Paperwork share
+2.0 SD |
9,481 | 0.36 |
| 1,737 | 14 CFR 171
NON-FEDERAL NAVIGATION FACILITIES
High signals: Size
+1.7 SD · Restriction density
+1.6 SD · Directive share
+1.4 SD |
41,076 | 0.34 |
| 1,756 | 14 CFR 21
CERTIFICATION PROCEDURES FOR PRODUCTS AND ARTICLES
High signals: Size
+1.3 SD |
28,736 | 0.34 |
| 1,759 | 14 CFR 120
DRUG AND ALCOHOL TESTING PROGRAM
High signals: Restriction density
+1.3 SD · Directive share
+1.0 SD |
18,822 | 0.34 |
| 1,818 | 14 CFR 119
CERTIFICATION: AIR CARRIERS AND COMMERCIAL OPERATORS
High signals: Reading grade
+1.3 SD |
11,360 | 0.32 |
| 1,820 | 14 CFR 93
SPECIAL AIR TRAFFIC RULES
High signals: Size
+1.1 SD |
21,711 | 0.32 |
| 1,850 | 14 CFR 45
IDENTIFICATION AND REGISTRATION MARKING
High signals: Restriction density
+1.4 SD · Directive share
+1.3 SD |
4,286 | 0.31 |
| 2,038 | 14 CFR 23
AIRWORTHINESS STANDARDS: NORMAL CATEGORY AIRPLANES
High signals: Restriction density
+2.0 SD · Directive share
+1.4 SD |
10,959 | 0.26 |
Score: the mean of six signals, in standard deviations (SD). Across the CFR, the top 641 of 6,402 ranked parts (10%) get a flag for review; this list shows 25. A flag is not a finding.
Statutes behind the most text
- 49 U.S.C. 106: 1,532,459 words in 82 parts (99.3% of this agency's text)
- 49 U.S.C. 44701: 277,169 words in 2 parts (18.0% of this agency's text)
- 49 U.S.C. 44903: 149,067 words in 1 parts (9.7% of this agency's text)
- 49 U.S.C. 44732: 143,177 words in 1 parts (9.3% of this agency's text)
- 49 U.S.C. 44703: 108,864 words in 2 parts (7.1% of this agency's text)
- 49 U.S.C. 44730: 85,412 words in 1 parts (5.5% of this agency's text)
- 42 U.S.C. 7572: 65,703 words in 4 parts (4.3% of this agency's text)
- 42 U.S.C. 4321: 61,550 words in 3 parts (4.0% of this agency's text)
- 18 U.S.C. 6002: 28,241 words in 1 parts (1.8% of this agency's text)
- 28 U.S.C. 2461: 28,241 words in 1 parts (1.8% of this agency's text)
From the authority notes. A citation is not proof that the statute requires the rule.
Largest parts
- 14 CFR 25: AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES (149,067 words)
- 14 CFR 121: OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS (143,177 words)
- 14 CFR 60: FLIGHT SIMULATION TRAINING DEVICE INITIAL AND CONTINUING QUALIFICATION AND USE (133,992 words)
- 14 CFR 91: GENERAL OPERATING AND FLIGHT RULES (106,797 words)
- 14 CFR 61: CERTIFICATION: PILOTS, FLIGHT INSTRUCTORS, AND GROUND INSTRUCTORS (89,442 words)
- 14 CFR 135: OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT (85,412 words)
- 14 CFR 29: AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT (70,315 words)
- 14 CFR 27: AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT (53,167 words)
- 14 CFR 36: NOISE STANDARDS: AIRCRAFT TYPE AND AIRWORTHINESS CERTIFICATION (45,414 words)
- 14 CFR 125: CERTIFICATION AND OPERATIONS: AIRCRAFT HAVING A SEATING CAPACITY OF 20 OR MORE PASSENGERS OR A MAXIMUM PAYLOAD CAPACITY OF 6,000 POUNDS OR MORE; AND RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT (41,571 words)
Reading grade and sentence types are approximate. Simple rules label each sentence; the first match wins.