PLEASE REVIEW the OEM criteria is supplied by Airbus Helicopters Maintenance Manuals and Master Servicing. Most systems, equipment, structure is removed for the inspection as it relates to the airframe.

REFERENCE:

MSM – 05-25-00
MSM – front matters – breakdown of the MSM
AMM – Calendar Inspections –

At 144 months, for helicopters with a relatively low utilization rate, and in addition to the major inspection operations, it is recommended to perform the content of the basic inspection and its multiples as well as all the operations outside the inspection cycle, even if the limits do not coincide exactly, in order to start a full cycle.

This task includes all operations required to carry out a structural check of the helicopter. It is aimed at giving an inspection plan detailed in a logical order. Operators may adapt it to their own means provided all the requested operations are carried out.

12 year items – for as new condition helicopter

full structures review and repair. Key areas: canopy, windows, composites, metal cowls, crack inspection, corrosion, de-lams, mechanical damage, prior repairs, major mods, applicability of systems and approvals prior to import or export. (Country specific requirements )

Tailboom ring. Xmsn deck. Cabin floor, floor edging, xframe mod, fins for cracking / smoking rivets, sliding door mods and track condition, doors including function and hinges, driveshaft covers.

Composites review of all conditions and repair quotes. Canopy removal for full sanding and reinforcement of door post area if required. Floor attached area. Fwd nose light can be removed and lower intermediate cowls modified. On composite panels Foam core basically melts or shrinks inside over time and delaminates. Honeycomb Core get crushed and delams.

MR and TR Blade condition – rubber poly under the surface paint must be intact. Leading edge abrasion and de-bond to be checked. Last repairs?

Engine – to OEM. Calendar items? Cycle items coming due? TU’s updated? Trend Monitor data? Soaps? Dust environment?

Components – overhauled within 24 yrs? Condition since last 12 yr. Last 6yr complete corrosion complete and noted on hard cards per ATA60.

AVA 6yr 3000hr, LG Dampers 5400hr, Mast 6yr, MR SP Bearing, Cross beam check, TR Spider Brg, TR DS Brg, Hyd Brg. – ALL Have Calendar and some Hourly.

Landing Gear condition, skids and cross tubes. Cross tubes normally fail inspection for corrosion. Worn rubber at attachment allow corrosion. Normally deep pitting found.

Skid tube bottoms worn? Normally the skid shoe has a hole, and then wears into tube.

Replacement of interior? Removal – repaint of interior – floor – rear – upper – instrument panel.

Complete re-wire or re-wire of Nav / Com or changes. 25 Mz Digital FM, ADS-B, backup Comm, Collision avoidance, and upgrades Etc.

Cabin sand and paint? Seats? Airframe sand and paint? Complete exterior paint? Structures repairs if required? Sima Seats have inspections in CMM.

Cabin Flooring – floor edging. Seat cushions or covers.

All windshields and door glass?

Seat belts re-web? Calendar limit or inspection required?

Control systems are completed removed and inspected. Thus painting of the entire equipment should be completed. Be AWARE unpainted control tubes may not pass the 12 year corrosion inspection. Pitting is common. Expensive replacement if many tubes U/S.

Any oil or calendar hydraulic lines replaced.

All filters to be replaced.

Rubber seals, window seals, doors seals, cowl seals, firewall seals?

Confirm firewall for condition?

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STC equipment – inspection and or repairs to be completed.
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12 Year and 6 Year Inspection checks for Airbus Helicopters AS350, AS355

When applicable – Aircraft shipping – customs – brokerage – freight charges – fly in -arrival check – test flight – powercheck – oil soap – vib check – track and balance – systems / avionics function test – snags/ squaks

Disassembly

• Review of complete helicopter / quote for standard work / quote for additional work / new equipment required / changes to the equipment / STC’s / mods / upgrades

• Review of aircraft logs. flight logs, airframe component cards, engine logs. correct TTAF, cycles, Ng, Np, Hook, Landings

• Over limits check VEMD, or HUMS, or FDM

• Confirm current status of and up to date – Airworthiness Directives, Mod Status, Service Bulletins, TU’s, STC installations current, ICA’s, STC inspections to be carried out – confirm current revisions of all documents

• Electrical drawings for all systems

• Weight and Balance and equipment list records

• Current paint codes as required

12   YEAR  AIRFRAME MAJOR INSPECTION EXPLANATION

 

 

MSM 05-25-00

MSM 05-26-00 1-5 hrs, 2-10 hrs, 15hrs, etc

MSM 05-35 Optional Equipment

 

THE 12 YEAR IS DUE 12 YEARS FROM THE LAST MAJOR INSPECTION WHICH COULD HAVE BEEN CALLED A  MAJOR -G- INSPECTION OR A MAJOR -C- INSPECTION OR A MAJOR 5000 HOUR INSPECTION.

 

THE 12 YEAR ITEMS CALLED OUT IN THE ABOVE WORK CARD WHICH RELATE TO PRE MOD NUMBERS DEPEND ON MOD STATUS. IF THE A-C IS POST MOD THEN THE SUBJECT LISTED WOULD BE N/A.

 

A- CHECK THE  MSR REQUIREMENTS FOR THE 600,1200,2400 INSP.

 IF THEY ARE DUE, THEN INCLUDE THEM IN THE 12 YEAR.

 

B- CHECK THE REQUIREMENTS OF THE 2, 4, 6 YEAR INSPECTION,

IF THEY ARE DUE ,THEN INCLUDE THEM IN THE 12 YEAR.

 

C- RE-CALL THE BASIC INSPECTION CALLED OUT IN MSM 05-21-00 IS TO BE C/W

AS PART OF THE 12 YR.

 

 THUS PERFORM THE FOLLOWING;

 

BASIC INSPECTION  PER AMM

 

AND

 

12 year INSPECTION PER  AMM

 

PLUS

 

2 – 4 – 6 YEAR ITEMS PER THE MSM 05-25-00

 

6 AND 12 YEAR DYNAMIC COMPONENT INSPECTION ON COMPONENTS WHICH HAVE NOT BEEN OVERHAULED IN 12 YEARS IS A SEPARATE SUBJECT. ASK FOR THAT ATTACHMENT IF IT EFFECTS YOU.

 

 

12 YEAR WORKSHEET GUIDE

 

05-25-00

 

1- Make -up a inspection check list for the 12 year

x- include 2,4,6 year MSR items that are due OR

x- include 500-1000-1500-2000 hour MSR items that are due.

X  include mwc 05-23-00-601- basic inspection.

 

2- Check computer run-out sheet for TBO or LIFE items.

Remove all cowlings :

Drain FUEL-MGB-HYD-T.R.G.B.

 

3- Basic Inspect the a-c visually per MWC 05-23-00-601

Cracks, corrosion, security, condition, torque cks.

 

4-Engine oil tank: remove if pre-mod 07-0549 ( plastic tank) and clean.

Hydraulic tank:  remove if pre-mod 070667  (plastic tank)  and clean.

Metal tanks do not need removed.

Fuel tank: inspect for contamination and flush if needed.

 

5- Landing gear shock struts: remove and inspect per MRR 32-10-11-751

 

6- T/R control cable: change if pre mod. 07-2771

 

7- Stabilizers:

Change all attachment bolts.

Inspect all stabilizers and attachment areas.

 

8- Tail boom:

Remove and inspect the interface per MSR 53-00-00-402

Install new attachment bolts and torque.

 

9-  Cabin:

Remove all interior pieces.

Inspect the canopy for cracks .

 

x- door posts and pillars.

x- rain gutter area.

x- rear cabin attachment.

x- windshield cracks.

x- inspect all door locks,seals, latches and emergency releases.

 

 

 

 

10- Optional equipment:

remove all optional equipment and inspect the underlying areas.

 

11- Inspect all electrical bonding areas.

 

12- Heater lines:

Replace all the rigid P2 air lines: engine to cabin.

(caution: heater line part numbers depend on a-c configuration) see attachment.

 

13- Pilot and co-pilot controls: pre ams 07-2819

Inspect the cyclic and collective sticks per the requirements obtained from AEC.

(this entails a Rockwell or Vickers hardness test.) ( contact jerry stiles at aec for procedure)

 

14- Check flight control movement and check interference.

 

15-  Re weight the aircraft.

 

16-  Final Inspect the a-c using MWC 05-21-00-603 post flight.

 

17- Ground run.

Flight test.

Tracking and balancing.

Log books.

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