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63-13-01

final rule

Airworthiness Directives; BOEING All Model 75 Series Aircraft

Unsafe Condition: Propeller blade failures due to cracks within the hub area and at least 6 inches of the shank portion outside the hub.

Effective: Jun 21, 1963 Category: aircraft Compliance: Within 25 hours' time in service after the effective date of this AD, unless already accomplished...

Why matched: Airworthiness Directives; BOEING All Model 75 Series Aircraft

Technical illustration of an aircraft propeller assembly
Problem area Propeller

60-08-02

final rule

Airworthiness Directives; BOEING All Model 75 Series Aircraft

Unsafe Condition: Cracked fuselage longerons and fuselage diagonal bracing in the vicinity of the lower wing front spar attach fittings

Category: aircraft Compliance: not later than June 1, 1960, and at each 100 hours' time in service thereafter

Why matched: Airworthiness Directives; BOEING All Model 75 Series Aircraft

Technical illustration of a riveted aircraft structural panel and frame
Problem area Airframe structure

46-24-01

final rule

Airworthiness Directives; BOEING Model A75L3, 75, A75, B75, E75, A75J1, A75N1, B75N1, D75N1 Series Aircraft

Unsafe Condition: Water entrapment at the lower rear edge of the wing at the aileron gap due to inadequate drainage, leading to deterioration of rib ends.

Category: aircraft Compliance: next periodic inspection

Why matched: Airworthiness Directives; BOEING Model A75L3, 75, A75, B75, E75, A75J1, A75N1, B75N1, D75N1 Series Aircraft

Technical illustration of an aircraft flight control surface and actuator
Problem area Flight controls

50-06-02

final rule

Airworthiness Directives; BOEING Model 75 Series Aircraft

Unsafe Condition: Cracks, checks, and warping in the wing spar front and rear spars due to moisture ingress into the tank compartment.

Category: aircraft Compliance: at each annual inspection. For military aircraft, compliance also required prior to original cert...

Why matched: Airworthiness Directives; BOEING Model 75 Series Aircraft

Technical illustration of a riveted aircraft structural panel and frame
Problem area Airframe structure

49-23-01

final rule

Airworthiness Directives; BOEING Model 75 Series Airplanes

Unsafe Condition: Altered fuselage bottom truss installations for crop dusting or seeding hoppers may lack equivalent structural strength, leading to potential failure of the truss members.

Category: aircraft Compliance: prior to next periodic inspection

Why matched: Airworthiness Directives; BOEING Model 75 Series Airplanes