Airworthiness Directive · Amendment 39-19542 · Landing gear
the Boeing Company Airplanes
(1) This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category. These airplanes are specified in paragraphs (c)(1)(i) through (c)(1)(vii) of this AD.
(i) Airplanes in Groups 1 and 2, Configuration 1, as identified in Boeing Special Attention Service Bulletin 737-32-1448, Revision 2, dated August 2, 2017 (“BSASB 737-32-1448, R2”).
(ii) Airplanes in Groups 1 and 2, Configuration 2, as identified in BSASB 737-32-1448, R2.
(iii) Airplanes in Group 3, as identified in BSASB 737-32-1448, R2.
(iv) Airplanes in Groups 4 and 5, Configuration 1, as identified in BSASB 737-32-1448, R2, except where this service bulletin specifies the groups as line numbers 3527 through 6510 inclusive, this AD specifies those groups as line number 3527 through any line number of an airplane with an original Certificate of Airworthiness or an original Export Certificate of Airworthiness dated on or before the effective date of this AD.
(v) Airplanes in Groups 4 and 5, Configuration 2, as identified in BSASB 737-32-1448, R2, except where this service bulletin specifies the groups as line numbers 3527 through 6510 inclusive, this AD specifies those groups as line number 3527 through any line number of an airplane with an original Certificate of Airworthiness or an original Export Certificate of Airworthiness dated on or before the effective date of this AD.
(vi) Airplanes in Groups 6 as identified in BSASB 737-32-1448, R2, except where this service bulletin specifies the groups as line numbers 3527 through 6510 inclusive, this AD specifies those groups as line number 3527 through any line number of an airplane with an original Certificate of Airworthiness or an original Export Certificate of Airworthiness dated on or before the effective date of this AD.
(vii) All Model 737-600, -700, -700C, -800, -900 and -900ER series airplanes with an original Certificate of Airworthiness or an original Export Certificate of Airworthiness dated after the effective date of this AD.
(2) Installation of Supplemental Type Certificate (STC) ST00830SE does not affect the ability to accomplish the actions required by this AD. Therefore, for airplanes on which STC ST00830SE is installed, a “change in product” alternative method of compliance (AMOC) approval request is not necessary to comply with the requirements of 14 CFR 39.17.
We are superseding Airworthiness Directive (AD) 2016-18-01, which applied to certain The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. AD 2016-18-01 required repetitive lubrication of the forward and aft trunnion pin assemblies of the right and left main landing gears (MLGs); repetitive inspection of these assemblies for corrosion and chrome damage, and related investigative and corrective actions if necessary; and installation of new or modified trunnion pin assembly components, which terminated the repetitive lubrication and repetitive inspections. Since we issued AD 2016-18-01, we have determined that rotable parts were not addressed in that AD, and it is therefore necessary to include all airplanes of the affected models in the applicability. This AD retains the requirements of AD 2016-18-01, adds airplanes to the applicability, and prohibits the installation of a MLG or MLG trunnion pin assembly under certain conditions. We are issuing this AD to address the unsafe condition on these products.
For airplanes identified in paragraphs (c)(1)(i), (c)(1)(iii), (c)(1)(iv), or (c)(1)(vi) of this AD: Except as required by paragraph (l) of this AD, at the applicable time specified in Table 1, Table 2, Table 4, or Table 5, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, do an inspection to determine if any of the existing part numbers identified in paragraph 2.C.3., “Parts Modified and Reidentified,” of BSASB 737-32-1448, R2, are installed. A review of airplane maintenance records is acceptable in lieu of this inspection if the part number of each existing part number can be conclusively determined from that review. Repetitive lubrication and inspection as required by and at the times specified in paragraphs (h) and (i) of this AD are also acceptable in lieu of this inspection to determine the MLG trunnion pin assembly part number.
For airplanes identified in paragraphs (c)(1)(i), (c)(1)(iii), (c)(1)(iv), or (c)(1)(vi) of this AD, having any part number identified in paragraph 2.C.3., “Parts Modified and Reidentified,” of BSASB 737-32-1448, R2, installed: Except as required by paragraph (l) of this AD, at the applicable time specified in Table 1, Table 2, Table 4, or Table 5, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, lubricate the applicable forward and aft trunnion pin assemblies of the right and left MLGs, in accordance with Work Package 1 of the Accomplishment Instructions of BSASB 737-32-1448, R2. Repeat the lubrication thereafter at intervals not to exceed those specified in Table 1, Table 2, Table 4, or Table 5, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2. Accomplishment of the actions specified in paragraph (j) of this AD terminates the repetitive lubrication required by this paragraph.
For airplanes identified in paragraphs (c)(1)(i), (c)(1)(iii), (c)(1)(iv), or (c)(1)(vi) of this AD, having any part number identified in paragraph 2.C.3., “Parts Modified and Reidentified,” of BSASB 737-32-1448, R2, installed: Except as required by paragraph (l) of this AD, at the applicable time specified in Table 1, Table 2, Table 4, or Table 5, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, do a general visual inspection of the left and right MLGs at the forward and aft trunnion pin locations and the visible surfaces of the forward and aft trunnion pin assemblies for discrepancies including signs of corrosion or chrome plating damage, and lubricate the forward and aft trunnion pin assemblies as applicable, in accordance with Work Package 2 of the Accomplishment Instructions of BSASB 737-32-1448, R2. Repeat the general visual inspection thereafter at intervals not to exceed those specified in paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2. If any discrepancy is found during any inspection required by this paragraph, before further flight, do all applicable related investigative and corrective actions in accordance with Work Package 2 of the Accomplishment Instructions of BSASB 737-32-1448, R2. Accomplishment of the actions required by paragraph (j) of this AD terminates the repetitive inspections required by this paragraph.
For airplanes identified in paragraphs (c)(1)(i), (c)(1)(iii), (c)(1)(iv), or (c)(1)(vi) of this AD, having any part number identified in paragraph 2.C.3., “Parts Modified and Reidentified,” of BSASB 737-32-1448, R2, installed: Except as required by paragraph (l) of this AD, at the time specified in Table 1, Table 2, Table 4, or Table 5, as applicable, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, modify the left and right MLG trunnion pin assemblies, including all applicable related investigative and corrective actions, in accordance with Work Package 3 of the Accomplishment Instructions of BSASB 737-32-1448, R2. All applicable related investigative and corrective actions must be done at the time specified in paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2. Accomplishment of the actions in Work Package 3 of the Accomplishment Instructions of BSASB 737-32-1448, R2, terminates the repetitive lubrication required by paragraph (h) of this AD and the repetitive inspections required by paragraph (i) of this AD.
For airplanes identified in paragraphs (c)(1)(ii) and (c)(1)(v) of this AD: Except as required by paragraph (l) of this AD, at the time specified in Table 3 or Table 6, as applicable, of paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, replace the seal, retainer, and support ring assembly with a new seal and retainer configuration; install the forward trunnion pin assembly into the housing assembly; and lubricate the forward and aft trunnion pin assemblies for the left and right MLGs; in accordance with Work Package 4 of the Accomplishment Instructions of BSASB 737-32-1448, R2.
Where paragraph 1.E., “Compliance,” of BSASB 737-32-1448, R2, specifies a compliance time “after the Revision 2 date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
As of the effective date of this AD, no person may install existing parts identified in paragraph 2.C.3., “Parts Modified and Reidentified,” of BSASB 737-32-1448, R2, on any airplane identified in paragraphs (c)(1)(i) through (c)(1)(vii) of this AD, unless the actions required by paragraph (j) or (k), as applicable, of this AD have been accomplished on the parts.
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
