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CUSTOMER SERVICES DIRECTORATE 2 ROND POINT EMILE DEWOITINE 31700 BLAGNAC FRANCE TELEPHONE + 33 (0)5 61 93 33 33
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 1 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 28 – Low Pressure Shut Off Valve Installation AIRCRAFT TYPE: A319,A320,A321 OUR REF.: A28N007-20 Rev 01 dated 27-APR-2020 OUR PREVIOUS REF: A28N007-20 Rev 00 dated 30-MAR-2020
0. REASON FOR REVISION ***BEG REV*** This AOT is revised to incorporate some minor corrections and update references related to CEO and NEO aircraft type.
AOT A28N007-20 Rev 01 cancels and supersedes AOT A28N007-20 Rev 00.
***END REV***
1. AIRCRAFT AFFECTED 7920, 8038, 8043, 8068, 8079, 8085, 8090, 8093, 8106, 8107, 8108, 8110, 8121, 8122, 8131, 8132, 8133, 8134, 8135, 8137, 8138, 8139, 8141, 8142, 8143, 8144, 8145, 8146, 8147, 8148, 8149, 8150, 8151, 8152, 8153, 8154, 8155, 8156, 8157, 8158, 8159, 8160, 8161, 8162, 8163, 8164, 8165, 8166, 8167, 8168, 8169, 8170, 8171, 8172, 8173, 8174, 8175, 8176, 8177, 8178, 8179, 8180, 8181, 8182, 8183, 8184, 8185, 8186, 8187, 8188, 8189, 8190, 8191, 8192, 8193, 8194, 8195, 8196, 8197, 8198, 8199, 8200, 8201, 8202, 8203, 8204, 8205, 8206, 8207, 8208, 8209, 8210, 8211, 8212, 8213, 8214, 8215, 8216, 8217, 8218, 8219, 8220, 8221, 8223, 8224, 8225, 8226, 8227, 8228, 8229, 8230, 8231, 8232, 8233, 8234, 8235, 8236, 8237, 8238, 8239, 8240, 8241, 8242, 8243, 8244, 8245, 8246, 8247, 8248, 8249, 8250, 8251, 8252, 8253, 8254, 8255, 8256, 8257, 8258, 8259, 8260, 8261, 8262, 8263, 8264, 8265, 8266, 8267, 8268, 8269, 8270, 8271, 8272, 8273, 8274, 8275, 8276, 8277, 8278, 8279, 8280, 8281, 8282, 8283, 8284, 8285, 8286, 8287, 8288, 8289, 8290, 8291, 8292, 8293, 8294, 8295, 8296, 8297, 8298, 8299, 8300, 8301, 8302, 8303, 8304, 8305, 8306, 8307, 8308, 8309, 8310, 8311, 8312, 8313, 8314, 8315, 8316, 8317, 8318, 8319, 8320, 8321, 8322, 8323, 8324, 8325, 8326, 8327, 8328, 8329, 8330, 8331, 8332, 8333, 8334, 8335, 8336, 8337, 8338, 8339, 8340, 8341, 8342, 8343, 8344, 8345, 8346, 8347, 8348, 8349, 8350, 8351, 8352, 8353, 8354, 8355, 8356, 8357, 8358, 8359, 8360, 8361, 8362, 8363, 8364, 8365, 8366, 8367, 8368, 8369, 8370, 8371, 8372, 8373, 8374, 8375, 8376, 8377, 8378, 8380, 8381, 8382, 8383, 8384, 8385, 8386, 8387, 8388, 8389, 8390, 8391, 8392, 8393, 8394, 8395, 8396, 8397, 8398, 8399, 8400, 8401, 8402, 8403, 8404, 8405, 8406, 8407, 8408, 8409, 8410, 8411, 8412, 8413, 8414, 8415, 8416, 8417, 8418, 8419, 8420, 8421, 8422, 8423, 8424, 8425, 8426, 8427, 8428, 8429, 8430, 8431, 8432, 8433, 8434, 8435, 8436, 8437, 8438, 8440, 8441, 8442, 8443, 8444, 8445, 8446, 8447, 8448, 8449, 8450, 8451, 8452, 8453, 8454, 8455, 8456, 8457, 8458, 8459, 8460, 8461, 8462, 8463, 8464, 8465, 8466, 8467, 8468, 8469, 8470, 8471, 8472, 8473, 8474, 8475, 8476, 8477, 8478, 8479, 8480, 8481, 8482, 8483, 8484, 8485, 8486, 8487, 8488, 8489, 8490, 8491, 8492, 8493, 8494, 8495, 8496, 8497, 8498, 8499, 8500, 8501, 8502, 8503, 8504, 8505, 8506, 8507, 8508, 8509, 8510, 8511, 8512, 8513, 8514, 8515, 8516, 8517, 8518, 8519, 8520, 8521, 8522, 8523, 8524, 8525, 8526, 8527, 8528, 8529, 8530, 8532, 8533, 8534, 8535, 8536, 8537, 8538, 8539, 8540, 8541, 8542, 8543, 8544, 8545, 8546, 8548, 8549, 8550, 8551, 8552, 8553, 8554, 8555, 8556, 8557, 8558, 8559, 8560, 8561, 8562, 8563, 8564, 8565, 8566, 8567, 8568, 8569, 8570, 8571, 8572, 8573, 8574, 8575, 8576, 8577, 8578, 8579, 8580, 8581, 8582, 8583, 8584, 8585, 8586, 8587, 8588, 8589, 8590, 8591, 8592, 8593, 8594, 8595, 8596, 8598, 8599, 8600, 8601, 8603, 8604, 8605, 8606, 8607, 8608, 8609, 8610, 8611, 8612, 8613, 8614, 8615, 8616, 8617, 8618, 8619, 8620, 8621, 8622, 8623, 8624, 8625, 8626, 8627, 8628, 8629, 8630, 8631, 8632, 8633, 8634, 8635, 8636, 8637, 8638, 8639, 8640, 8641, 8642, 8643, 8644, 8645, 8646, 8647, 8648, 8649, 8650, 8651, 8652, 8653, 8654, 8655, 8656, 8657, 8658, 8659, 8660, 8661, 8662, 8663, 8664, 8665, 8666, 8667, 8668, 8669, 8670, 8671, 8672, 8673, 8674, 8675, 8676, 8677, 8678, 8679, 8680, 8681, 8682, 8683, 8684, 8685, 8686, 8687, 8688, 8689, 8690, 8691, 8692, 8693, 8694, 8695, 8696, 8697, 8698, 8699, 8700, 8701, 8702, 8703, 8704, 8705, 8706, 8707, 8708, 8709, 8710, 8711, 8712, 8713, 8714, 8715, 8716, 8717, 8718, 8719, 8720,
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 2 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 8721, 8722, 8723, 8724, 8725, 8726, 8727, 8728, 8729, 8730, 8731, 8732, 8733, 8734, 8735, 8736, 8737, 8738, 8739, 8740, 8741, 8742, 8743, 8744, 8745, 8746, 8747, 8748, 8749, 8750, 8751, 8752, 8753, 8754, 8755, 8756, 8757, 8758, 8759, 8760, 8761, 8762, 8763, 8764, 8765, 8766, 8767, 8768, 8769, 8770, 8771, 8772, 8773, 8774, 8775, 8776, 8777, 8778, 8779, 8780, 8781, 8782, 8783, 8784, 8785, 8786, 8787, 8788, 8789, 8790, 8791, 8792, 8793, 8794, 8795, 8796, 8797, 8798, 8799, 8800, 8801, 8802, 8803, 8804, 8805, 8806, 8807, 8808, 8809, 8810, 8811, 8812, 8813, 8814, 8815, 8816, 8817, 8818, 8819, 8820, 8821, 8822, 8823, 8824, 8825, 8826, 8827, 8828, 8829, 8830, 8831, 8832, 8833, 8834, 8835, 8837, 8838, 8839, 8840, 8842, 8843, 8844, 8846, 8847, 8848, 8849, 8850, 8851, 8852, 8853, 8854, 8855, 8856, 8857, 8858, 8859, 8860, 8861, 8862, 8863, 8864, 8865, 8866, 8867, 8868, 8869, 8870, 8871, 8872, 8873, 8874, 8875, 8876, 8877, 8878, 8879, 8880, 8881, 8882, 8883, 8884, 8885, 8886, 8887, 8888, 8889, 8890, 8891, 8892, 8893, 8894, 8895, 8896, 8897, 8898, 8899, 8900, 8901, 8902, 8903, 8904, 8905, 8906, 8907, 8908, 8909, 8910, 8911, 8912, 8913, 8914, 8915, 8916, 8917, 8918, 8919, 8920, 8921, 8922, 8923, 8924, 8925, 8926, 8927, 8928, 8929, 8930, 8931, 8932, 8933, 8934, 8935, 8936, 8937, 8938, 8939, 8940, 8941, 8942, 8943, 8944, 8945, 8946, 8947, 8948, 8949, 8950, 8951, 8952, 8953, 8954, 8955, 8956, 8957, 8958, 8959, 8960, 8961, 8962, 8963, 8964, 8965, 8966, 8967, 8968, 8969, 8970, 8971, 8972, 8973, 8974, 8975, 8976, 8977, 8978, 8979, 8981, 8982, 8983, 8984, 8985, 8986, 8988, 8989, 8990, 8991, 8993, 8994, 8995, 8996, 8997, 8998, 8999, 9000, 9001, 9002, 9009, 9010, 9011, 9012, 9013, 9014, 9015, 9016, 9017, 9018, 9019, 9020, 9021, 9022, 9023, 9024, 9025, 9026, 9027, 9028, 9029, 9030, 9031, 9032, 9034, 9035, 9036, 9037, 9038, 9039, 9040, 9041, 9042, 9043, 9044, 9045, 9046, 9047, 9049, 9050, 9051, 9052, 9053, 9054, 9055, 9056, 9057, 9058, 9059, 9060, 9061, 9062, 9063, 9064, 9065, 9066, 9067, 9068, 9069, 9070, 9071, 9072, 9073, 9074, 9075, 9076, 9077, 9078, 9079, 9081, 9082, 9083, 9084, 9085, 9086, 9087, 9088, 9089, 9090, 9091, 9092, 9093, 9095, 9096, 9097, 9099, 9103, 9104, 9105, 9106, 9107, 9108, 9109, 9110, 9111, 9112, 9113, 9114, 9115, 9116, 9117, 9118, 9119, 9121, 9122, 9124, 9125, 9126, 9127, 9128, 9129, 9130, 9131, 9132, 9133, 9134, 9136, 9137, 9139, 9140, 9141, 9142, 9143, 9144, 9145, 9146, 9147, 9148, 9149, 9152, 9153, 9154, 9155, 9158, 9159, 9161, 9162, 9163, 9165, 9166, 9167, 9169, 9170, 9171, 9172, 9173, 9174, 9175, 9176, 9177, 9178, 9179, 9180, 9181, 9183, 9184, 9186, 9188, 9189, 9190, 9192, 9193, 9194, 9196, 9197, 9198, 9200, 9201, 9202, 9203, 9204, 9205, 9206, 9207, 9208, 9211, 9213, 9214, 9215, 9216, 9217, 9220, 9221, 9222, 9223, 9224, 9225, 9227, 9229, 9231, 9232, 9233, 9235, 9237, 9239, 9241, 9242, 9243, 9244, 9246, 9247, 9248, 9249, 9250, 9251, 9252, 9253, 9256, 9257, 9258, 9259, 9260, 9263, 9264, 9269, 9270, 9271, 9272, 9273, 9274, 9275, 9276, 9277, 9280, 9282, 9283, 9284, 9287, 9290, 9291, 9292, 9294, 9296, 9300, 9303, 9304, 9305, 9306, 9308, 9309, 9310, 9312, 9313, 9314, 9316, 9317, 9320, 9321, 9322, 9324, 9328, 9329, 9330, 9331, 9332, 9334, 9338, 9339, 9340, 9341, 9342, 9343, 9346, 9348, 9351, 9352, 9353, 9354, 9356, 9358, 9359, 9360, 9361, 9362, 9363, 9367, 9369, 9372, 9375, 9378, 9381, 9384, 9388, 9391, 9392, 9397, 9400, 9405, 9407, 9408, 9409, 9410, 9413, 9418, 9421, 9425, 9426, 9431, 9435, 9439, 9446, 9451, 9454, 9457, 9463, 9469, 9473, 9476, 9479, 9482, 9484, 9486, 9494, 9497, 9502, 9505, 9508, 9511, 9514, 9519, 9523, 9526, 9528, 9531, 9532, 9551, 9554, 10001, 10002
2. REFERENCED DOCUMENTATION
2.1 APPENDIX
2.2 REFERENCES ***BEG REV*** For CEO: IPC 28-24-05 - VALVE INSTL-LOW PRESSURE For NEO: IPC 28-24-85 - VALVE INSTL-LOW PRESSURE ***END REV*** AMM TASK 28-24-41-000-001-A Removal of the LP Fuel Valve AMM TASK 28-24-41-400-001-A Installation of the LP Fuel Valve
3. REASON ***BEG REV***
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 3 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT This AOT is issued to alert all operators that an inspection of the Low Pressure Shut Off Valve is required, as two cases of leak at the LPSOV have been reported from the field.
***END REV***
3.1 FACTS Two in-service cases of fuel leak at the LPSOV interface have been reported. Based on associated investigations, it was assessed that the root cause of these leaks was an improper installation of the LPSOV during production LPSOV installation:
Fig 1 In both cases, it was discovered that the O-ring (ref 8) was extruded from its groove due to an improper installation of the LPSOV.
3.2 CONSEQUENCES ***BEG REV*** Potential fire on aircraft due to spillage on hot area and or potential loss of fuel ***END REV***
3.3 AIM As a precautionary measure, Airbus requires that the operators of the concerned A/C perform an inspection of LP Fuel Valve installation before 750FC/750FH or 4 months (whichever comes first) from date of issuance . In case the installation of the LP Fuel Valve is discovered faulty, removal of the LP Fuel Valve, replacement of the O-rings and re-installation of the valve is required.
4. SHORT TERM ACTION NOTE: This AOT is classified mandatory or expected to be classified mandatory by an Airworthiness Directive (AD). The accomplishment instructions marked as Required for Compliance (RC) must be done to comply with the AD. “RC” is indicating these paragraphs accordingly.
NOTE: The access and close-up instructions, not comprising return to service tests, in this AOT do not constitute or affect the technical intent of the AOT. Operators can therefore, as deemed necessary, omit
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 4 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT or add access and/or close-up steps to add flexibility to their maintenance operations as long as the technical intent of the AOT is met within the set parameters.
Task: Inspection of the Engine 1 and 2 Low Pressure Fuel Valve FIN 12QM/13QM installation.
1. Gain access to the LP Fuel Valve 12QM/13QM by removing access panels 522AT/622AT reference: Aircraft Maintenance Manual (AMM) 57-41-37-000-003-A - Removal of the Access Panel.
2. Perform a detailed visual inspection of the LP Fuel valve FIN 12QM/13QM installation, referenced attached figures. In particular check, using suitable tools: (refer to figure 2 and 3)
(a) The LP valve (item 14) face plate is seated correctly against its mounting plate (item 9): check that any gap between the LPSOV (item14) face plate and its mounting plate (item 9) is no greater than 0.254mm (0.010 inch)
(b) That there are no signs of the LP valve O ring (seal Item 8) trapped between the LP valve (item 14) face plate and its mounting plate (item 9) on the front spar.
(c) There are no visible signs of a fuel leak.
(d) That all 3 installation bolts (item 5) and installation bolt (item 6) are seated correctly i.e. no gap between the bolt and the LP valve flange.
***BEG REV***
3. If any of the above is not correct then remove the LP valve 12QM/13QM and O ring seal as per AMM: TASK 28-24-41-000-001-A - Removal of the LP Fuel Valve.
Perform a visual inspection of the mounting plate (item 9) attached to the front spar. Inspect the front face and bolt holes of the mounting plate (A), chamfered edge (B) and inner face (C) for any signs of damage. If any damage is found please contact Airbus for further instructions.
Install new O-ring seals as per AMM task 28-24-41-400-001-A - Installation of the LP Fuel Valve (for LP fuel valve bolts, apply torque value given in point 4).
4. If all the above steps in section 2 are satisfactory then perform a torque check of the 4 LP valve mounting bolts (Items 5 and item 6) to ensure the torque is between 0.7 and 0.8 m.daN
(61.95 and 70.80 lbf.in). Note: the AMM task for LPSOV installation will be updated accordingly and will be available in the August revision.
5. Close access to the LPSOV 12QM/13QM by re-installing access panels 522AT/622AT.
reference: AMM 57-41-37-400-003-A - Installation of the Access Panel ***END REV***
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 5 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Fig 2 Fig 3
4.1 PLANNING AND MANPOWER
4.1.1 RC - ACCOMPLISHMENT TIMESCALE Airbus requires that the operators of the concerned A/C perform the task before 750FC/750FH or 4 months (which ever come first) from date of issuance.
4.1.2 MANPOWER The estimated time to perform the task on both wings is 3 hours.
4.2 DESCRIPTION See Above.
4.2.1 ACCESS See Above.
4.2.2 RC - INSPECTION REQUIREMENTS See Above.
4.2.3 RC - FINDINGS Report the condition of all LP Fuel Valve installation findings to Airbus;
4.3 SPARES AND TOOLING ***BEG REV***
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28N007-20 Rev 01 Page 6 of 6 Date: 27-APR-2020 © AIRBUS S.A.S. 2020. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT AMM 28-24-41 ITEM (see fig 2)
DESIGNATION CEO IPC FIGURE NEO IPC FIGURE 3 O-ring 28-21-05-25 ITEM 070 28-21-85-20 ITEM 530 2 O-ring 28-21-05-25 ITEM 080 28-21-85-20 ITEM 050 8 O-ring 28-24-05-01 ITEM 120 28-24-85-01 ITEM 100 ***END REV***
5. FURTHER INFORMATION
5.1 FOLLOW-UP PLAN As this issue could only potentially occur on the previously mentioned aircraft (refer to AIRCRAFT AFFECTED), no further action will be performed by Airbus. The application of this AOT will fully address the issue.
5.2 IMPACTED DOCUMENTATION No documentation will be impacted.
6. AOT APPROVAL The technical content of this document is approved under the authority of DOA nr. EASA.21J.031.
7. REPORTING Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Domain ATA 28-24.
As per latest reporting policy (Ref to OIT 999.0018/16), inspection results (with or without findings) are to be addressed to Airbus Customer Services through the generic e-mail address:
inspection.results@airbus.com.
Best Regards, Christian FREMONT
VICE PRESIDENT ENGINEERING SUPPORT
CUSTOMER SERVICES Jean-Pierre GOMEZ VICE PRESIDENT A320 PROGRAMME