SAE AS 4052C:2022-10-26

SAE AS 4052C:2022-10-26

Gland Design: Scraper, Landing Gear, Installation

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Détails

This SAE Aerospace Standard (AS) covers an alternate gland design for the installation of scraper/ wiper rings in the lower end of landing gear shock struts for the purpose of contaminant exclusion.
The defined scraper gland covered by this document, as shown in Table 1, is a variant of AS4716, the accepted gland standard for AS568, O-ring packing seals. Piston rod diameters, gland internal diameters, groove sidewall angles and the surface finish are all defined by AS4716, but the gland outer retaining wall diameter is changed. The traditional scraper design installed into the glands detailed in Table 1 typically utilize components made from PTFE, urethane, or nitrile materials. These scraper designs, while still acceptable, must be reviewed in consideration to deicing, cleaners and disinfectant fluids applied to or in contact with the landing gear, as the materials of construction for the installed scrapers may not be compatible to these fluids. Exposure of the scraper to incompatible fluids is likely to reduce the performance of the scraper.
In addition, an alternative scraper gland is also covered by this document and shown in Table 2. It is also a variant of AS4716, however, this gland has a reduced atmospheric gland lip and profiled lead in geometry to allow for a PTFE jacket metal spring energized scraper to be installed. The advantages of the PTFE jacket metal spring energized scraper design are that the materials of construction are chemically inert, greatly reducing the possibility of negative performance due to incompatibility with deicers, cleaners, and disinfectant fluids.
AS4088 is similar to the hardware design in Tables 1A and 1B of this document, which was developed by SAE A-6 for flight control and general-purpose cylinders. It differs from this document primarily by the clearance between the rod (piston) and outer gland wall.

Informations supplémentaires

Auteur Society of Automotive Engineers International (SAE)
Comité A-5B Gears, Struts and Couplings Committee
Edité par SAE
Type de document Norme
ICS 49.045 : Structure et éléments de structure
Nombre de pages 21
Remplace SAE AS 4052B:2021-02-03
Historique SAE AS 4052B:2021-02-03,SAE AS 4052A:2006-08-02,SAE AS 4052:1994-04-01
Mot-clé SAE 4052,SAE AS4052C,SAE AS4052C,SAE AS 4052