UH-1 Maintenance

UH-1 MAINTENANCE BLOG

204-076-052-009
205-076-099-007
main rotor servo
OHC condition

Federal Aviation Administration

FAA AD 2022-20-14: Main Rotor Gearbox

The FAA is adopting a new airworthiness directive (AD) for Bell Textron Inc., Model 204B, 205A, 205A-1, 205B, 210, 212, 412, 412CF, and...

Bell Helicopter

ASB UH-1H-22-23 TAILBOOM ATTACHMENT HARDWARE

ASB UH-1H-22-23 Page 1 of 7 Approved for public release. ALERT SERVICE BULLETINUH-1H-22-23 20 July 2022 MODEL AFFECTED:UH-1H SUBJECT:...

Federal Aviation Administration

AD 2022-22-12-AD was prompted by reports of two in-service failures of forward crosstubes

[Federal Register, Volume 87 Number 214 (Monday, November 7, 2022)] [Rules and Regulations] [Pages 66942-66945] From the Federal Register...

Federal Aviation Administration

FAA AD 2022-21-11: Main rotor blades

Direct Link to NEW AD https://drs.faa.gov/browse/excelExternalWindow/FR-ADFRAWD-2022-22014-0000000000.0001?modalOpened=true [Federal...

Federal Aviation Administration

FAA AD 2022-07-02: Rotorcraft Tail Boom

2022-07-02 .PDF FILE [Federal Register Volume 87, Number 64 (Monday, April 4, 2022)] [Rules and Regulations] [Pages 19369-19371] From the...

Federal Aviation Administration

AD 2022-01-03 Umlaut Engineering GmbH (Previously P3 Engineering)

Federal Register Volume 87, Number 20 (Monday, January 31, 2022)] [Rules and Regulations] [Pages 4797-4800] From the Federal Register...

Federal Aviation Administration

Main Drive Shaft Airworthiness Directive

[Federal Register Volume 87, Number 14 (Friday, January 21, 2022)] [Rules and Regulations] [Pages 3176-3182] From the Federal Register...

Federal Aviation Administration

FAA SB: Risk of Potential Adverse Effects on Radio Altimeters

SAIB: AIR-21-18 Date: November 2, 2021 This document contains information and recommended action. The contents of this document do not...

Federal Aviation Administration

Main Rotor System Airworthiness Directive- Request for Comment

[Federal Register Volume 86, Number 143 (Thursday, July 29, 2021)] [Rules and Regulations] [Pages 40779-40782] From the Federal Register...

Federal Aviation Administration

Rotorcraft Tail Boom Airworthiness Directive

[Federal Register Volume 86, Number 140 (Monday, July 26, 2021)] [Rules and Regulations] [Pages 39942-39949] From the Federal Register...

Federal Aviation Administration

FAA Emergency Airworthiness Directive (AD) 2021-15-52

July 8, 2021 AD #: 2021-15-52 Emergency Airworthiness Directive (AD) 2021-15-52 is sent to owners and operators of various restricted...

Federal Aviation Administration

MAIN ROTOR HUB STRAP PIN 204-012-104-005, REMOVAL FROM SERVICE

Alert Service Bulletin From Bell that effects UH-1 Fleet

Debra Jossi

GHI informational letter UH1-98-11 dated 10-7-98 - Inspection of Upper Left Hand tailboom attachment

Originally published 6/26/2014 This Letter from 1998 was submitted in relation to other posts on the blog regarding the Upper Left Hand...

Federal Aviation Administration

Proposed Rule on Main Driveshaft

Posted by the Federal Aviation Administration on Mar 25, 2021 FAA Site link for this NPRM HERE Action Notice of proposed rulemaking...

Debra Jossi

Aviation Health and Usage Monitoring Systems (HUMS) for UH-1 Industry

Huntsville, Alabama - We are pleased to introduce RMCI, Inc. and their advanced Health and Usage Monitoring Systems, or HUMS. The...

Jeff Armstrong- Rampart Helicopters

Cracked Grips on Compsite MR Blades

Composite blades PN 205-015-150-101 Rampart Helicopters sent in composite blades for biannual inspection, several cracks in the grip...

FINALLY Lord T.T. Straps

LORD CORPORATION HAS RELEASED THEIR T.T. STRAPS FOR SALE OUTSIDE OF BELL HELICOPTER. LORD HAS BEEN MAKING THESE IDENTICAL STRAPS FOR BELL...

Peter Frinchaboy

Unintended Load Release Solution

There have been many unintended external load releases over the years and here is a simple way to reduce that number. Install this...

Federal Aviation Administration

Proposed AD - Failure of Tailboom Attaching Points

FEDERAL REGISTER LINK TO MAKE COMMENTS Action Notice of proposed rulemaking (NPRM). Summary The FAA proposes to adopt a new airworthiness...

Peter Frinchaboy

Main Rotor Drag Brace Outer Attaching Hardware

In my travels over the years I have found MANY aircraft with the main rotor outer drag brace bolt hardware incorrectly installed. General...

Peter Frinchaboy

UH-1 Main Rotor Re-torque

This has been brought up before about a re-torque after main rotor installation. In this case the TM 55-1520-210-23-1 is not a help....

Peter Frinchaboy

Mixing Lever to Scissors Lever Control Tube

I find this all the time on aircraft, another standard aircraft hardware installation, again not a standard, Huey installation, in the...

Peter Frinchaboy

Lower Fuel Cell Floor Panels

Many lower fuel cell floor panels have been damaged in removal see attached photo. These panels should be removed every 3 & 6 phase or at...

Edward C Pease and John Moore

Combustor Rumble

Combustor Rumble can be a problem in engines that reverse the combustion gas flow prior toentering the 1st stage gas producer nozzle....

Peter Frinchaboy

UH-1D/H/V Fuel System

The UH-1 D, E,H, V fuel system is not a simple system. In this article I will explain how it works, identify components and how they...

Philip Fienan

LubriBor- Fuel Lubricity Additive

NOTE FROM UH1OPS While we usually stick to maintenance articles on UH1OPS MAINTENANCE BLOGs, we support this product and after seeing the...

Peter Frinchaboy

Using the TM 55-1520-210-23P manuals

To assist those who were not military and taught how to read the TM Manuals for UH-1 Maintenance. On the text pages that go with the...

Bell Helicopter

SAIB-18-29R1 Rotorcraft Tail Boom, Attach Structure Failure

SUBJ: Rotorcraft Tail Boom, Attach Structure Failure SAIB: SW-18-29R1 Date: February 19, 2019 This is information only....

Altitude Aviation Services, LLC.

UH-1 Tailboom Motion Detection System

On September 16, 2013, about 1535 Pacific daylight time, a Garlick UH-1B, N204UH, experienced a tailboom separation while logging in...

Jon Robbins

Track and Balance - The Main Rotor for Now

Original Article: Helicopter Maintenance Magazine 2/1/2012 Before I say anything else, I want to point out that there is a lot of...

David Wilson Valley Aerospace

Dealing with Corrosion in Control Tubes/Rods

Halloween Update! Dealing with spookiest part of aging Helicopters, Corrosion! This update focuses on the importance of inspecting the...

Bell Helicopter

ASB UH-1H-18-20 Main Rotor Blades -113

ALERT SERVICE BULLETIN UH-1H-18-20 23 October 2018 MODEL AFFECTED: UH-1H SUBJECT: MAIN ROTOR BLADE 204-011-250-113, INTRODUCTION OF...

Debra Jossi

Drive Shaft Removal Tool

Do you know the P/N of the UH1 drive shaft removal tool? We have a customer looking for one and our company doesn’t have it. They stated...

David Wilson

Using Heat and Proper Alignment when Pressing Bearings into Critical Bores

This picture clearly shows the importance of using heat, and proper alignment when pressing bearings into critical bores. This damage was...

Peter Frinchaboy

TT Straps Time Life

We received a question this week in regards to time life on TT Straps retirement life. When I looked at our old component sheets, we...

Dave Wilson, Valley Aerospace, LLC

DMWR FOR ROTOR BRAKE QUILL

Our main goal when building this platform was to provide resources to the UH-1 industry. We appreciate maintenance questions sent our...

Peter Frinchaboy- David Burch Rotorbreeze 2007

Leading Edge Pitch Link Main Rotor to Mast Coupling Phenomenon

Thought this article is a good item to share. Published in Rotorbreeze 2006 by the now retired David Burch Bell Helicopter Senior...

Peter Frinchaboy

Main Rotor Retaining Nut Lock

I was contacted by a mechanic who in the process of removing a main rotor hub assembly after removing the main rotor found that the...

Peter Frinchaboy

Stabilizer Bar Adjustment

I was contacted by a mechanic that found the following when removing the stabilizer bar prior to removing the main rotor hub and blades...

Peter Frinchaboy

Collective Ground Adjustment

HAVE YOU CHECKED YOUR COLLECTIVE FRICTION LATELY? I just received a couple of photos of the set screws used to make adjustment of the...

Peter Frinchaboy

42 & 90 Degree Gearbox Caps

A couple of weeks ago I was asked to give some basic information to the maintenance man the pickup team brought with them. He hadn’t...

Peter Frinchaboy

UH-1 Maintenance Training Course

Do you have a new mechanic or mechanics that need a refresher course on the UH-1 helicopter? Do you need an IA renewal? Peter Frinchaboy...

Kevin Shields President of Trans Aero, Ltd.

Do You Really Know Your Aircraft’s Lifting Capability and Its Limitations?

Know Your Capabilities and your Limitations Scenario: You are doing a lift job with little margin. The Load calculation indicates the...

Peter Frinchaboy

Engine Igniters

In the photo below there are two Igniters, the one on the left shows that the spark is concentrated on one area of the igniter. Hard to...

Peter Frinchaboy

Servo Mount Nuts

Hi this is Pete from Metro Fire again. On the NTSB accident website there is an accident involving aircraft UH-1H N260TA 5-23-2014. There...

Robert Peterson Sunset Aviation Services

HYDRAULIC SYSTEM HEALTH & WELL BEING

With the military releasing aircraft to civilian operators, many civilian operators are following the maintenance schedule the military...

Peter Frinchaboy

Collective Bounce

I have heard of at least four aircraft in the last six months having hard landings some severe, luckily with no fatalities. In each event...

Peter Frinchaboy

Droop Cam Jack Shaft

In 1992 UH-1-92 ASAM-13 was issued that later became TB1-1520-210-19 one time & recurring inspection of the droop compensator jackshaft....

Peter Frinchaboy

Main Rotor Support and Bumpers

The military main rotor was modified with a plate bolted to the bottom of the main rotor yoke and a support bolted to the mast just above...

Altitude Aviation Services, LLC.

Recent Linear Actuator Failure

One of our operators shared the following information after one of their pilots had a linear actuator failure while fighting fires in...

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MAIN ROTOR HUB STRAP PIN 204-012-104-005, REMOVAL FROM SERVICE

GHI informational letter UH1-98-11 dated 10-7-98 - Inspection of Upper Left Hand tailboom attachment

Proposed Rule on Main Driveshaft

Aviation Health and Usage Monitoring Systems (HUMS) for UH-1 Industry

Cracked Grips on Compsite MR Blades

FINALLY Lord T.T. Straps

Combustor Rumble

UH-1 Tailboom Motion Detection System

Engine Igniters

Servo Mount Nuts

FAA AD 2022-20-14: Main Rotor Gearbox

ASB UH-1H-22-23 TAILBOOM ATTACHMENT HARDWARE

AD 2022-22-12-AD was prompted by reports of two in-service failures of forward crosstubes

FAA AD 2022-21-11: Main rotor blades

FAA AD 2022-07-02: Rotorcraft Tail Boom

AD 2022-01-03 Umlaut Engineering GmbH (Previously P3 Engineering)

Main Drive Shaft Airworthiness Directive

FAA SB: Risk of Potential Adverse Effects on Radio Altimeters

Main Rotor System Airworthiness Directive- Request for Comment

Rotorcraft Tail Boom Airworthiness Directive

UH-1 Operations

Support for uh-1 Helicopter Operators

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UH-1 MAINTENANCE BLOG

204-076-052-009
205-076-099-007
main rotor servo
OHC condition

UH-1 MAINTENANCE BLOG

204-076-052-009 205-076-099-007 main rotor servo OHC condition

204-076-052-009
205-076-099-007
main rotor servo
OHC condition