TASK 70-11-39-300-503Cold Ferric Chloride Local Etch

DMC:V2500-00-70-11-39-00A-251A-D|Issue No:002.00|Issue Date:2016-08-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 70-11-39-300-503Cold Ferric Chloride Local Etch

General

Cold ferric chloride etching can be recommended in the Engine Manual as a single procedure or as part of a sequence of procedures, to prepare the surfaces of heavily-stressed parts such as turbine blades for inspection. It gives a smooth, matte surface that shows inclusions and surface damage together with other small defects that are not easily seen with the eye.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

CAUTION

THE PROCEDURE MUST BE CAREFULLY CONTROLLED AND ONLY APPLIED TO THE PARTS SPECIFIED IN THE ENGINE MANUAL. THE STRENGTH OF THE MATERIAL CAN BE DANGEROUSLY DECREASED, BY CORROSION, IF THE PROCEDURE IS NOT CORRECTLY APPLIED.

CAUTION

RUBBER, THAT CONTAINS A LARGE QUANTITY OF SULFUR, MUST NOT BE USED TO MAKE JIGS, TANK LININGS, OR BASKETS. IT CAN CAUSE CONTAMINATION THAT WILL PREVENT A SATISFACTORY ETCH.

Procedure

    1. SUBTASK 70-11-39-300-001 Procedure to Apply the Etch Locally

    1. Make sure that the part is at a temperature of approximately 59 to 77 deg F (15 to 25 deg C).

    2. Remove grease and oil from the part (refer to SPM TASK 70-11-03-300-503 or SPM TASK 70-11-26-300-503).

    3. Dry the part with a clean, soft cloth that is free from unwanted particles.

    4. Put a small quantity of new cotton wool into the solution (refer to SUBTASK 70-11-39-100-001).

    5. Apply the wet cotton wool to the area of the part to be etched and keep a film of solution on the surface for approximately 15 seconds, until a light, matt-gray, finish is seen on the machined surface.

    6. Put a small quantity of new cotton wool into some clean cold water.

    7. Use the wet cotton wool to remove all the acid from the part.

    8. Repeat F and G.

    9. Dry the part with a clean soft cloth or new cotton wool.

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised Title (16VC226A)

Change Type:

Deleted warning and revised steps (16VC226A)