Airworthiness Directive · Amendment 39-14750 · Boeing Model 737-200, -300, -400, and -500 Series Airplanes Equipped With an Auxiliary Fuel System Installed in Accordance With Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY
Boeing Model 737-200, -300, -400, and -500 Series Airplanes Equipped With an Auxiliary Fuel System Installed in Accordance With Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY
This AD applies to Boeing Model 737-200, -300, -400, and -500 series airplanes, certificated in any category; equipped with an auxiliary fuel system installed in accordance with Supplemental Type Certificate (STC) SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY; having serial numbers (S/N) listed in Table 1 of this AD.
| For model— | Having S/N(s)— | As identified in PATS aircraft service bulletin— |
|---|---|---|
| 737-200 series airplanes | 22431 and 22628 | SA83NE-28-SB-002-IR, dated June 7, 2006. |
| 737-200 series airplanes | 22600 | SA1078NE-28-SB-005-A, Revision A, dated June 21, 2006. |
| 737-200, -300, -400, and -500 seriesairplanes | 23800, 22620, 23124, 23468, 26333, 26307, 27456, 27426, and 27906 | SA725NE-28-SB-007-B, Revision B, dated July 27, 2006. |
| 737-500 series airplanes | 24970 | ST00040NY-28-SB-003-IR, dated June 7, 2006. |
| 737-500 series airplanes | 28866 | ST01337NY-28-SB-002-IR, dated June 7, 2006. |
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-200, -300, -400, and -500 series airplanes equipped with an auxiliary fuel system installed in accordance with STC SA83NE, SA1078NE, SA725NE, ST00040NY, or ST01337NY. This AD requires a one-time deactivation of the auxiliary fuel system, repetitive venting of the auxiliary fuel tanks, and revising the Limitations section of the airplane flight manual to limit the maximum cargo weight. This AD results from a re-evaluation of the floor structure and cargo barriers conducted by the STC holder. We are issuing this AD to prevent structural overload of the auxiliary fuel tank support structure, which could cause the floor beams to fail and resultant damage to the primary flight controls and the auxiliary power unit fuel lines that pass through the floor beams, and consequent loss of control of the airplane. We are also issuing this AD to prevent structural overload of the cargo barriers, which could cause the barriers to fail, allowing the cargo to shift, resulting in possible damage to the auxiliary fuel tanks, residual fuel leakage, and consequent increased risk of a fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “service bulletin,” as used in this AD, means the Part IV “Accomplishment Instructions,” and Part V “Maintenance Requirements,” of the applicable PATS Aircraft service bulletin identified in Table 1 of this AD.
Within 30 days after the effective date of this AD: Do the actions in paragraphs (g)(1) and (g)(2) of this AD.
(1) Deactivate the auxiliary fuel system by doing all of the actions specified in Part IV of the applicable service bulletin.
(2) Revise the Limitations section of the applicable Boeing airplane flight manual (AFM) to include revised maximum cargo weight limits specified in the applicable PATS Aircraft AFM supplement identified in Table 2 of this AD. Operate the airplane according to the limitations in the applicable AFM supplement.
| For model— | Having S/N(s)— | STC— | STC configuration(s)— | Use PATS aircraft AFM supplement— |
|---|---|---|---|---|
| 737-200 series airplanes | 23124 | SA725NE | 2 | 148, dated May 31, 2006. |
| 737-200 series airplanes | 22620 and 23468 | SA725NE | 3 and 8 | 149, Revision A, dated August 11, 2006. |
| 737-200 series airplanes | 22600 | SA1078NE | 3 Tank forward | 152, dated May 31, 2006. |
| 737-200 series airplanes | 22431 and 22628 | SA83NE | 2 | 155, dated May 31, 2006. |
| 737-300 series airplanes | 27456, 26307, and 26333 | SA725NE | 1 and 6 | 147, dated May 31, 2006. |
| 737-300 series airplanes | 23800 | SA725NE | 7 | 151, dated May 31, 2006. |
| 737-400 and -500 series airplanes | 27906 and 27426 | SA725NE | 4 and 5 | 150, dated May 31, 2006. |
| 737-500 series airplanes | 28866 | ST01337NY | Aft 3-tank | 153, Revision A, dated August 3, 2006. |
| 737-500 series airplanes | 24970 | ST00040NY | 7 | 154, dated May 31, 2006. |
After deactivating the auxiliary fuel system as specified in paragraph (g) of this AD: Following each flight, vent the auxiliary fuel tanks by doing all of the actions specified in paragraph A. of Part V of the applicable service bulletin.
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
