| AD Number | 76-16-06 | Status | Active |
| Effective Date | August 19, 1976 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-2693 |
| Product Type | ["Aircraft"] | Product Subtype | ["Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Lockheed Martin Corporation |
| Model(s) | L-1011-385-1 L-1011-385-1-14 L-1011-385-1-15 L-1011-385-3 |
76-16-06 LOCKHEED-CALIFORNIA: Amendment 39-2693. Applies to Lockheed L- 1011-385 Series airplanes certificated in all categories.
Compliance required as indicated. To prevent serious degradation of airplane flight performance due to possibility of missing Visco Jet Restrictors, P/N 19XVC112DN1 or P/N VXCA2501112D, in the A and B rudder control system, accomplish the following:
(a) Within the next 10 additional hours time in service or 24 hours after receipt of this telegraphic AD, whichever occurs earlier, discontinue training flights, and do not dispatch any airplane with the C system main pump or C system air turbine motor pump inoperative, until (b) is accomplished.
(b) Within the next 50 additional hours time in service after receipt of this telegraphic AD, perform the following inspection:
(1) Turn on aircraft electric power, no hydraulic power.
(2) Turn on B system AC motor driven hydraulic pump.
(3) Note and record hydraulic system B pressure indicated on flight engineering panel.
(4) Engage 8 degree mechanical rudder limiter stops with switches on overhead instrument panel.
(5) Slowly push rudder pedals to move rudder against travel limiter, then continue to push pedal until stop is felt.
(6) Note and record system B hydraulic pressure. If pressure is at least 200 psi lower than recorded in step 3, Visco Jet Restrictor is missing.
(7) Release pedal.
(8) Turn on hydraulic system power transfer unit B to A.
(9) Open circuit breaker K-12 on CB-2 panel 'Rudder Servo A.'
(10) Switch off rudder Servo with guarded switch on overhead instrument panel.
(11) Note and record system A hydraulic pressure on flight engineers panel. (If pressure fluctuates widely turn on/off servos as required to minimize fluctuations.)
(12) Repeat item 5.
(13) Note and record system A hydraulic pressure. If pressure is at least 200 psi lower than recorded in step 11, Visco Jet Restrictor is missing.
(14) Release pedal.
(15) Turn off hydraulic and electric power.
If the Visco Jet Restrictor(s) is not installed, install prior to further flight. Record compliance and method of compliance with this AD per FAR 91.173.
(c) Equivalent inspections and installation may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.
(d) Special flight permits may be issued per FAR 21.197 and 21.199 to operate the airplane to a base to perform the inspection or repair required by (b), provided that the C System main pump and C System air turbine motor pump are operative.
This amendment is effective August 19, 1976 for all persons except those to whom it was made effective by telegram dated July 23, 1976, which contained this amendment.