Standard Parts

WHAT IS A STANDARD PART? Mentioning standard parts usually brings to mind the thought of merely “nuts or bolts” when, in fact, other types of parts as well as materials used to produce aviation parts may fall under the category of “standard part.”

The definition of standard part as per Advisory circular 21-29(pdf) is as follow:

"A part manufactured in complete compliance with an established industry or U.S. Government specification which includes design, manufacturing, test and acceptance criteria, and uniform identification requirements; or for a type of part which the Administrator has found demonstrates conformity based solely on meeting performance criteria, is in complete compliance with an established industry or U.S. Government specification which contains performance criteria, test and acceptance criteria, and uniform identification requirements. The specification must include all information necessary to produce and conform the part and be published so that any party may manufacture the part. Examples include, but are not limited to, National Aerospace Standard (NAS), Army-Navy Aeronautical Standard (AN), Society of Automotive Engineers (SAE), SAE Sematec, Joint Electron Device Engineering Council, Joint Electron Tube Engineering Council, and American National Standards Institute (ANSI)."

CONSIDERATIONS. When purchasing and installing standard parts, consider the following:

 • A Certificate of Conformity (C of C) should be provided by the producer of a standard part.

 • A standard part should carry a mark indicating the part has been produced in accordance with the specification requirements.

• A part is no longer considered “standard” if it is used in a critical application that imposes qualification or quality control requirements beyond the standard specification.

• To facilitate traceability, commingling like fasteners from different lots is not recommended.

 • Section 21.303(b)(4) provides that acceptable government specifications are limited to those published by the U.S. Government. Parts produced to a foreign standard may, however, be acceptable for installation on foreign type-certificated aircraft and products.

 • Installation of a standard part must be in accordance with the requirements of part 43. Generally, a standard part may be replaced with an identical standard part; however, substituting standard parts would require a demonstration of acceptability in accordance with part 43.

Hamkar is also one of main standard parts supplier in Iran for different brands likewise: SKF, FAG, Lincoln, etc… 

چه تفاوتی بین یک سیستم روانکاری اتوماتیک موازی و مرحله‌ای وجود دارد


در یک سیستم روانکاری اتوماتیک مرحله‌ای تک‌خطه، یک پمپ مرکزی گریس را به نقاط گریس‌کاری از طریق مقسم گریس به صورت مرحله‌ای می‌رساند. گریس از مقسم اولیه به مقسم‌های گریس ثانویه و در نهایت از طریق خطوط تغذیه به نقاط گریس‌کاری جریان می‌یابد. ماهیت این سیستم به این صورت است که اگر یکی از خطوط گریس‌کاری یا نقاط گریس‌کاری دچار نقص شود، کل سیستم از کار می‌افتد و سوپروایزر به صورت چشمی آگاه شده و از آسیب جدی کل سیستم جلوگیری به عمل می‌آورد