224 The 1979 Chicago Crash

critical systems needed to provide the pilot with information essential to safe flight are completely redundant. (Class II, Priority Action) (A-79-99)

Initiate and continue strict and comprehensive surveillance efforts in the following areas:

(a) Manufacturers quality control programs to assure full compliance with approved manufacturing and process specifications; and

(b) Manufacturer's service difficulty and service information collection and dissemination systems to assure that all reported service problems are properly analyzed and disseminated to users of the equipment, and that appropriate and timely corrective actions are effected. This program should include full review and specific FAA approval of service bulletins which may affect safety of flight. (Class II, Priority Action) (A-79-

100)

Assure that the maintenance review board fully considers the following elements when it approves an airline/manufacturer maintenance program:

(a) Hazard analysis of maintenance procedures which involve removal, installation, or work in the vicinity of structurally significant components in order to identify and eliminate the risk of damage to those components;

(b) Special inspections of structurally significant components following maintenance affecting these components; and

(c) The appropriateness of permitting 'On Condition" maintenance and, in particular, the validity of sampling inspection as it relates to the detection of damage which could result from undetected flaws or damage to structurally significant elements during manufacture or maintenance. (Class II, @ority Action) (A-79-101)

Require that air carrier maintenance facilities and other desig-

nated repair stations:

(a) Make a hazard analysis evaluation of proposed maintenance procedures which deviate from those in the manufacturer's manual and which involve removal, installation, or work in the vicinity of structurally significant components; and

(b) Submit proposed procedures and analysis to the appropriate representative of the Administrator, FAA, for approval. (Class II, Priority Action) (A-79-102)

Revise 14 CFR 121.707 to more clearly define "major' and "minor"

repair categories to insure that the reporting requirement will