AD 63-08-01

final rule
Data completeness: 70%

Airworthiness Directives; Aero Commander Model 520 Aircraft

AD Number
63-08-01
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Twin Commander Aircraft LLC 520 Airworthiness Directives; Aero Commander Model 520 Aircraft

Unsafe Condition

Fuel quantity indicator needles stick in one position while fuel continues to be consumed, and transmitters become worn or inoperative resulting in inaccurate fuel quantity indications.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Inspect and repair or replace the fuel quantity indicator and transmitter units, recalibrate the gaging system every 300 hours' time in service, attach a placard to the instrument panel, or replace the system with an improved gaging system. Initial compliance within 100 hours' time in service after April 9, 1963.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

within the next 100 hours' time in service after the effective date of this AD

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Aero Commander Model 520, serial numbers 1 through 130 with the fuel gaging system having the dual needle quantity indicator installed.

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

This site is not affiliated with or endorsed by the FAA. Always verify with official sources.

View Official Source ↗ Find More ADs for Twin Commander Aircraft LLC 520

Related Airworthiness Directives

98-20-34

final rule

Airworthiness Directives; Twin Commander Aircraft Corporation Models 500, 500-A, 500-B, 500-S, 500-U, 520, 560, 560-A, 560-E, 560-F, 680, 680-E, 680FL(P), 680T, 680V, 680W, 681, 685, 690, 690A, 690B, 690C, 690D, 695, 695A, 695B, and 720 Airplanes.

Unsafe Condition: Airplane Flight Manuals--Severe Icing Conditions

Effective: Nov 3, 1998 Category: aircraft

98-07-17

final rule

Airworthiness Directives; Twin Commander Aircraft Corporation 500, 520, 560, 680, 681, 685, 690, 695, and 720 Series Airplanes

Unsafe Condition: Flap System

Effective: May 29, 1998 Category: aircraft

98-08-19

final rule

Airworthiness Directives; Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes

Unsafe Condition: Wing to Fuselage Attachment Brackets and Straps

Effective: May 18, 1998 Category: aircraft

94-04-13

final rule

Airworthiness Directives: Twin Commander Aircraft Corporation 500, 600, and 700 Series Airplanes

Unsafe Condition: Spar Cap

Effective: Apr 12, 1994 Category: aircraft

View all Twin Commander Aircraft LLC ADs →