2.3 Maintenance Recordkeeping & Return-to-Service Entries (14 CFR 43.9 & 43.11)

2.3 Maintenance Recordkeeping & Return-to-Service Entries

In aviation maintenance, work is not legally finished until the paperwork is correctly executed. A flawless mechanical repair without a conforming logbook entry leaves the aircraft technically unairworthy. The Federal Aviation Administration enforces rigorous standards for maintenance record entries under 14 CFR § 43.9 (maintenance, preventive maintenance, rebuilding, and alterations) and 14 CFR § 43.11 (inspections).

1. Maintenance Record Entries (§ 43.9)

Each person who maintains, performs preventive maintenance, rebuilds, or alters an aircraft, airframe, engine, propeller, appliance, or component part must make an entry in the maintenance record containing the four essential elements:

                    THE 4 REQUIRED ELEMENTS OF A 14 CFR § 43.9 ENTRY
  ┌────────────────────────────────────────────────────────────────────────┐
  │ 1. DESCRIPTION OF WORK PERFORMED                                       │
  │    - Concise summary of work done or reference to FAA-acceptable data  │
  │    - Example: "Removed and replaced left main gear brake lining in     │
  │      accordance with Piper PA-28-181 Maintenance Manual, Chapter 32."  │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 2. DATE OF COMPLETION                                                  │
  │    - Calendar date on which the maintenance work was completed         │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 3. NAME OF PERSON PERFORMING WORK                                      │
  │    - Required only if the work was performed by someone other than the │
  │      person approving return to service (e.g., supervised apprentice)  │
  ├────────────────────────────────────────────────────────────────────────┤
  │ 4. SIGNATURE, CERTIFICATE NUMBER, & KIND OF CERTIFICATE                │
  │    - Signature of the individual approving return to service           │
  │    - Certificate number (e.g., 3894721)                                │
  │    - Kind of certificate held (e.g., "A&P" or "Mechanic: Airframe &    │
  │      Powerplant")                                                      │
  └────────────────────────────────────────────────────────────────────────┘

Exam Watch Item: Total time in service is NOT a required element for a standard maintenance or repair entry under 14 CFR § 43.9! While recording total time is standard industry practice, § 43.9 strictly requires only: Description of work, Date, Name of person performing (if applicable), and Signature / Certificate Number / Kind of Certificate. In contrast, total time in service IS mandatory for inspection entries under § 43.11.

2. Inspection Record Entries (§ 43.11)

Inspections conducted under Part 91 (100-hour, annual, progressive) require a specialized entry format under 14 CFR § 43.11. The entry must contain:

1. Type of inspection and a brief description of the extent of the inspection.
2. Date of the inspection and aircraft total time in service.
3. Signature, certificate number, and kind of certificate held by the person approving or disapproving for return to service.
4. Mandatory Certification Statement (verbatim or standardized equivalent):

Standardized Wording for Airworthy Inspection Release

"I certify that this aircraft has been inspected in accordance with a (insert type: 100-hour / annual) inspection and was determined to be in an airworthy condition."

Date: August 29, 2026 | Total Time: 2,450.5 Hours
Signature: John R. Doe | Certificate: A&P 3948572 IA

Standardized Wording for Unairworthy Inspection Release

If the aircraft is found to be unairworthy, the mechanic or IA must NOT state the aircraft is airworthy. Instead, the certifying person makes the following logbook entry:

"I certify that this aircraft has been inspected in accordance with an (annual / 100-hour) inspection and a list of discrepancies and unairworthy items dated August 29, 2026, has been provided for the aircraft owner or operator."

Date: August 29, 2026 | Total Time: 2,450.5 Hours
Signature: Jane M. Smith | Certificate: A&P 4829103 IA

3. Discrepancies and Unairworthy Items (§ 43.11(b))

When an inspection reveals unairworthy defects (e.g., cracked spar, leaking fuel cell, overdue AD):

• The inspector does NOT write the list of discrepancies into the permanent aircraft logbook where it would permanently mar the aircraft's history.
• The inspector must furnish a signed and dated list of discrepancies and unairworthy items directly to the owner/operator.
• The owner/operator may then hire any certificated A&P mechanic (or repair station) to rectify individual discrepancy items.
• When a discrepancy is corrected, the repairing mechanic makes a standard § 43.9 entry for the specific repair. Once all discrepancies on the list are signed off, the aircraft is restored to airworthy status without requiring a complete re-inspection of the entire aircraft.

4. Record Retention Rules under 14 CFR § 91.417

Section 91.417 separates aircraft maintenance records into two categories with distinct retention schedules:

Temporary Maintenance Records (§ 91.417(a)(1) & (b)(1))

Records of maintenance, preventive maintenance, alterations, 100-hour, annual, and progressive inspections must be retained:

• Until the work is repeated or superseded by other work, OR
• For 1 year after the work is completed.

Permanent Maintenance Records (§ 91.417(a)(2) & (b)(2))

The following records must be retained permanently and transferred with the aircraft upon sale:

1. Total time in service of the airframe, each engine, each propeller, and each rotor.
2. Current status of life-limited parts of each airframe, engine, propeller, rotor, and appliance.
3. Time since last overhaul of all items installed on the aircraft which are required to be overhauled on a specified time basis.
4. Current inspection status of the aircraft, including the time since the last inspection required by the inspection program under which the aircraft is maintained.
5. Current status of applicable Airworthiness Directives (ADs), including method of compliance, AD number, revision date, and next recurring due date/hours.
6. Copies of FAA Form 337 for each major repair and major alteration.

Comparative Matrix: Record Retention & Entry Types