Airworthiness Directive · Amendment 39-18264 · Fuel
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category, line numbers 1 through 1164 inclusive.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by reports of latently failed fuel shutoff valves discovered during fuel filter replacement. This AD requires revising the maintenance or inspection program to include a new airworthiness limitation. We are issuing this AD to detect and correct latent failures of the fuel shutoff valve to the engine, which could result in the inability to shut off fuel to the engine and, in case of certain engine fires, an uncontrollable fire that could lead to wing failure.
Within 30 days after the effective date of this AD, revise the maintenance or inspection program, as applicable, to add Airworthiness Limitation (AWL) 28-AWL-MOV by incorporating the information specified in figure 1 to paragraph (g) of this AD into the Airworthiness Limitations Section of the Instructions for Continued Airworthiness. The initial compliance time for accomplishing the actions specified in figure 1 to paragraph (g) of this AD is within 10 days after accomplishing the maintenance or inspection program revision required by this paragraph.
| AWL No. | Task | Interval | Applicability | Description |
|---|---|---|---|---|
| 28-AWL-MOV | ALI | 10 days INTERVAL NOTE: Not required on days when the airplane is not used in revenue service. Must be done before further flight if it has been 10 or more calendar days since last inspection. | Airplanes with AIMS-1 system Airplanes with AIMS-2 BlockPoint (BP) v 16 and earlier software. APPLICABILITY NOTE: Only applies to airplanes with a fuel spar valve actuator having part number MA20A2027 (S343T003-56) or MA30A1001 (S343T003-66) installed at the engine fuel spar valve position. | Engine Fuel Shutoff Valve (Fuel Spar Valve) MOV Actuator Inspection. Concern: The fuel spar valve actuator design can result in airplanes operating with a failed fuel spar valve actuator that is not reported. A latently failed fuel spar valve actuator would prevent fuel shutoff to an engine. In the event of certain engine fires, the potential exists for an engine fire to be uncontrollable. Perform an inspection of the fuel spar valve actuator. NOTE: The fuel spar valve actuator is located behind latch panel 551 DB (left engine) and latch panel 651 DB (right engine). 1. Make sure both Engine Control Switches are in the CUTOFF position. NOTE: It is not necessary to cycle the FUEL CONTROL switch to do this inspection. |
| 2. Inspect the left engine fuel spar valve actuator located in the left rear spar. a. Verify the manual override handle on the left engine fuel spar valve actuator is in the CLOSED position. b. Repair or replace any fuel spar valve actuator that is not in the CLOSED position (refer to Boeing Airplane Maintenance Manual, 28-22-02, for guidance). 3. Inspect the right engine fuel spar valve actuator located in the right rear spar. a. Verify the manual override handle on the right engine fuel spar valve actuator is in the CLOSED position. b. Repair or replace any fuel spar valve actuator that is not in the CLOSED position (refer to Boeing Airplane Maintenance Manual, 28-22-02, for guidance). |
After accomplishing the maintenance or inspection program revision required by paragraph (g) of this AD, no alternative actions (e.g., inspections) or intervals may be used unless the actions or intervals are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (i)(1) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
