Adhesives
If no technical data is present, how much resin is required for each square foot of dry fabric?
25 grams
REFRENCE: TM 1-1500-204-23-11, page 6-48, paragraph 6-17. c. (2).
How much resistance is required to verify continuity in an EMI repair.
1 OHM or less
REFERENCE: TM 1-1520-280-23&P, EMI Shielding / Lightning Strike Protection
(Copper Mesh), step 7.
What is the minimum permissible vacuum for composite repairs?
20inches Hg
REFERENCE: TM 1-1500-280-23&P Vacuum Bag and Cure Procedure
What is acute toxicity?
The harmful effect of a material after a single or short-term exposure.
REFERENCE: TM 1-1500-204-23-11, page 2-2, paragraph 2-3. a. (1).
What are the three types of moisture damage?
Bond line voids, laminate blistering, and skin to core disbond.
REFERENCE: TM 1-1500-204-23-11, page 6-12, para. 6-6. b.
What is the mix ratio for EA 956?
100:58
REFERENCE: TM 1-1500-204-23-11, page 6-49, Figure 6-29, Example 2.
What is the maximum cleaned up diameter of removed core in Zone H?
Cleaned up damage of removed core NTE 3 inches diameter.
REFERENCE: TM 1-1520-280-23&P AIRFRAME MAINTENANCE PROCEDURES/MAINTENANCE PROCEDURES/AIRFRAME/STABILATOR/Stabilator Inspections, Table 1. General Repair Criteria - Composite Stabilator Repair.
Where are vacuum pucks placed?
Opposite ends of the 4 ounce non-woven breather cloth
TM 1-1500-280-23&P Vacuum Bag and Bleeder Schedule
What is a cold zone?
The area within 2 inches of the edge of any heat blanket which is unreliable for achieving and maintaining the proper cure temperature.
REFERENCE: EM 0284, TM 1-1520-280-23&P AIRFRAME MAINTENANCE
PROCEDURES/MAINTENANCE PROCEDURES/AIRFRAME/AIRFRAME REPAIR
PROCEDURES/Outboard Stabilator Composite Structure Repair - Vacuum Bag and Cure Procedures
OR 1-1500-204-23-11 CH6 par6-18c(2)
What are the disadvantages of the external bond patch?
Creates eccentric load path caused by offset of the neutral axes of the part and the patch which can cause interlaminar failure of the part or the patch and premature failure of the adhesive.
REFERENCE: TM 1-1500-204-23-11, page 6-28, paragraph 6-15. c. (1).
Why is it important to properly mix 2-part adhesives?
Using incorrect mix ratios will reduce the strength of adhesive and may result in loss of structural integrity.
REFERENCE: TM 1-1520-280-23&P, Airframe Maint Procedures/Maint Procedures/Airframe/Airframe Repair Procedures/Outboard Stabilator Composite Structure
How many repair plies are used to repair the far-side laminate and in which direction are they oriented?
2 Plies oriented at ±45 IML*
REFERENCE: TM 1-1520-280-23&P AIRFRAME MAINTENANCE PROCEDURES/MAINTENANCE PROCEDURES/AIRFRAME/AIRFRAME REPAIR PROCEDURES/Outboard Stabilator Composite Structure Repair - Composite Skin Repair/FARSIDE
LAMINATE REPAIRS, Table 2.
What is the bleeder schedule for Liquid Removal?
Steel Screen, 4oz Non-Woven Breather, Heat Blanket, 4oz Non-Woven Breather, Vacuum Bagging Film
REFERENCE: TM 1-1500-280-23&P Vacuum Bagging and Cure Procedures
What is "Wet Lay-up"?
A process in which dry woven cloth is impregnated with a liquid adhesive and then cured to form a laminate.
REFERENCE: TM 1-1500-204-23-11, Pg. 6-39, PARA 6-16, PDF 157.
What is cross-linking?
A chemical reaction which bonds the molecules of two-part resins together.
REFERENCE: TM 1-1500-204-23-11, page 4-12, paragraph 4-4. c.
What is the cure cycle for 1652 using an elevated temperature cure?
Gel at room temperature for 1 hour followed by an elevated temperature cure at 150°F for 2-3 hours.
REFERENCE: TM 1-1520-280-23&P AIRFRAME MAINTENANCE PROCEDURES/MAINTENANCE PROCEDURES/AIRFRAME/AIRFRAME REPAIR PROCEDURES/Outboard Stabilator Composite Structure Repair - Core Repair/CORE POTTING PROCEDURE, Step 4.b.(2)(a) and Table 1
What is the repair limit for Partial Thickness damage, Deep Scratches, Gouges and Cracks?
Up to Full Skin Depth Zone B, C, D - 6 inch diameter or less. NTE 0.015 inches deep.
TM 1-1500-280-23&P Stabilator Inspections Table 1
Where should thermocouples be placed?
1 inch from the edge of the repair area
REFERENCE: TM 1-1500-280-23&P Composite Skin Repair
What features should a composite fastener have?
Non-hole filling, large footprint, limited torque, limited or adjustable
clamping force.
REFERENCE: TM 1-1500-204-23-11, PG, PG 3-14, para 3-46, PDF 48.
What is the most practical cutout shape for damage removal?
A Circle
REFERENCE: TM 1-1500-204-23-11, page 6-3, para. 6-4.
To mix a total of 50 grams of EA 956, how much of Part A and Part B is required?
32 grams of Part A and 18 grams of Part B.
REFERENCE: TM 1-1500-204-23-11, page 6-49, Figure 6-29, Example 2.
How will wire mesh material be removed when repairing near side laminate?
0.25 inch larger than the largest repair ply using scouring pad.
TM 1-1500-280-23&P Remove Paint and Electromagnetic Interference (EMI) Protection
What is the cure cycle for EA 9396 at room temperature?
5 days
TM 1-1500-280-23&P Vacuum Bag and Cure Procedures
What is the formula for calculating the resistance of a heat blanket?
R = V2 ÷ W, where V is voltage and W is watts.
REFERENCE: TM 1-1500-204-23-11, page 3-4, paragraph 3-3 h. (3).
The warp clock measures positive angles in what direction?
Counterclockwise
REFERENCE: TM 1-1500-204-23-11, PDF 114.