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Lists necessary fixtures, tools, and support equipment for the repair.
Lists all consumable materials required for the task.
References other documents or indices relevant to the task.
Details critical safety measures to be observed before starting the procedure.
Instructions for cleaning the designated repair area.
Steps for preparing the sealant material before application.
Procedure for mixing the aerodynamic sealant components.
Instructions for applying the mixed sealant to the repair area.
Guidance on visually inspecting the completed sealant repair.
Procedure for marking the repair scheme number on the aircraft cowl.
Steps to close out the work area after completing the task.
This document outlines a repair procedure for the aerodynamic sealant on the air intake cowl or the P2/T2 sensor of Airbus A318/A319/A320/A321 aircraft. The procedure is designated as Task 71-11-11-300-014-A and is applicable to a wide range of aircraft serial numbers, specifically 0001-0004, 0007-0050, 0101-0107, 0109-0115, 0126-0150, 0204-0204, 0207-0207, 0209-0249, 0301-0350, 0401-0449, 0501-0549, 0651-0749, 0751-0799, and 0901-0970. The manual was last revised on May 01, 2018.
The primary function of this procedure is to repair damaged aerodynamic sealant, which is crucial for maintaining the aerodynamic integrity and performance of the aircraft's air intake cowl and P2/T2 sensor area. The sealant is applied between the lip skin and acoustic panels, as well as between acoustic panels themselves, and around the P2/T2 probe. Proper sealing in these areas prevents air leakage and ensures optimal airflow, which is vital for engine efficiency and overall aircraft performance.
Key technical specifications and requirements for the sealant application are detailed within the procedure. The replacement sealant must be level with, or not more than 0.010 inches (0.25 mm) below, the surface of the cowl. This precise tolerance is critical for maintaining the smooth aerodynamic profile of the air intake. The procedure specifies the use of specific materials: Methyl Ethyl Ketone (Material No. V01-076) for cleaning, teflon tape (Material No. V02-007) for masking, waterproof silicon carbide (Material No. V05-020) for removing contamination, and two types of sealant (Material No. V08-141 or V08-146) for the repair itself. A marking pen (Material No. V06-131) is also required for identifying the repair scheme number.
Usage features of the repair process involve a structured approach to sealant removal, surface preparation, and application. The job set-up includes safety precautions such as placing warning notices on the ENG panel 115VU and overhead maintenance panel 50VU to prevent engine start and FADEC energization, respectively. An adjustable access platform (2M/6FT) is required to position personnel for the repair. The removal of damaged sealant is performed using a plastic spatula, with a caution to avoid damaging the anodized surface of the lipskin or acoustic structure. Protective mats are recommended for the cowl. Teflon tape is applied on each side of the repair area to define the application boundaries.
Maintenance features are central to this document. The cleaning of the repair area involves soaking waterproof silicon carbide in Methyl Ethyl Ketone to remove remaining sealant or contamination, followed by drying with a lint-free cloth. The preparation of the aerodynamic sealant involves a specific mixing procedure for the two-part sealant in a pre-filled semkit cartridge. This includes pulling and pushing the dasher rod to inject contents and then mixing the sealant manually by pushing and rotating the dasher rod. A crucial note emphasizes that the dasher rod should rotate approximately 90 degrees during each movement, and the manufacturer's instructions should be followed for the exact number of mixing movements.
The application of the sealant is done using a plastic spatula or a sealant gun, ensuring the repair area is completely filled and the sealant is level with the cowl surface. A significant aspect of the maintenance is the curing process: the sealant must cure at ambient temperature for 48 hours, although it will not be tacky after approximately one hour. The document also notes that a 9°F or 5°C increase in cure temperature will halve the cure time, and refers to the sealant manufacturer's technical specifications for controlled curing. After curing, the teflon tape is removed.
Finally, a visual examination of the sealant repair is required to ensure correctness. If the repair surface is below the cowl surface, the application steps (C through E) must be repeated. The repair scheme number, VRS2725, is then identified on the cowl adjacent to the identification plate using a marking pen of a different color than the background. The close-up procedure involves removing all warning notices and access platforms. The document emphasizes the flammability of the sealant and the need to keep flames and non-flameproof electrical equipment away from the work area. It also reiterates the caution against damaging the anodized surfaces and the importance of using plastic tools and protective mats.
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