Mitsubishi Service Publications Transmittal
MITSUBISHI MU 2B · Service Bulletins
Overview
This document is a service bulletin issued by Mitsubishi Heavy Industries regarding the MU-2B series aircraft. It focuses on preventing hypoxia situations during flight, emphasizing the importance of following specific procedures to ensure pilot safety.
- The bulletin addresses hypoxia risks for MU-2B pilots.
- Pilots must set the Cabin Air Selector Switch to 'BOTH' after takeoff.
- Critical symptoms of hypoxia include impaired judgment and confusion.
- Cabin pressure low warnings are indicated by lights on the annunciator panel.
- Pilots should check oxygen cylinder pressure during preflight checks.
- A Voice Alerting System is available for enhanced safety.
- Descent to a safe altitude is required if cabin pressure remains low.
- All MU-2B pilots are encouraged to review AFMs and checklists regularly.
Document
Source
Originally published by mhi.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2022
- File size ·
- 155 KB
- Publisher ·
- mhi.com
- Language ·
- en
What is the Mitsubishi Service Publications Transmittal?
The Mitsubishi Service Publications Transmittal is a service bulletins for the MITSUBISHI MU 2B, dated 2022.
Where does the Mitsubishi Service Publications Transmittal come from?
This copy of the Mitsubishi Service Publications Transmittal was originally published by mhi.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the Mitsubishi Service Publications Transmittal published?
The Mitsubishi Service Publications Transmittal — the MITSUBISHI MU 2B service bulletins on file — is dated 2022.
Most owners only have the POH. Here's the essential set for the MITSUBISHI MU 2B.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
More MITSUBISHI MU 2Bmanuals & documents
In this document
Hypoxia Awareness
The document highlights the insidious nature of hypoxia and its critical symptoms that can impair a pilot's ability to fly.
Cabin Air Selector Switch
Pilots are required to set the Cabin Air Selector Switch to 'BOTH' in accordance with the AFTER TAKEOFF Procedures.
Cabin Pressure Monitoring
If cabin pressure altitude reaches approximately 10,000 feet, pilots must monitor the 'Cabin Pressure Low' light and take appropriate actions.
Emergency Procedures
In case of low cabin pressure, pilots are instructed to descend to a minimum safe altitude or 10,000 feet.
Preflight Checks
Pilots must check the oxygen cylinder pressure and ensure masks are available for all occupants.
Voice Alerting System
A Voice Alerting System provides spoken warnings to pilots when cabin pressure altitude limits are exceeded.
Safety notes
- Hypoxia can progress rapidly and may become fatal if not recognized.
- Pilots must adhere to the procedures outlined in the AFMs and checklists.
- Descent is mandatory if cabin pressure remains low after checks.
- Oxygen masks should be readily available for all pilots and passengers.
Full document text
MITSUBISHI HEAVY INDUSTRIES AMERICA INC. MITSUBISHI SERVICE PUBLICATIONS TRANSMITTAL The attached Mitsubishi MU-2B series Service Publication has been issued by Mitsubishi Heavy Industries, Ltd. in Japan, who is the type certificate holder of the MU-2 aircraft. It is the owner and/or operator’s responsibility to adhere to or comply with new information contained in the attached publication. SN 206 SN 155/21-004 Preventing Hypoxia Situation NOTE THIS PUBLICATION IS PRINTED AND/OR DISTRIBUTED BY MITSUBISHI HEAVY INDUSTRIES AMERICA, INC., UNDER LICENSE FROM MITSUBISHI HEAVY INDUSTRIES LTD. FOR COMMENTS OR INQUIRIES REGARDING DISTRIBUTION OF THIS PUBLICATION OR RECEIPT OF ANY OF THE PUBLICATIONS LISTED HEREIN, PLEASE CONTACT: Mitsubishi Heavy Industries America, Inc. Aircraft Product Support Division 17304 Preston Road, Suite 1270 Dallas, Texas 75252 USA Email: mu-2support@mhia.com THIS PAGE INTENTIONALLY LEFT BLANK Page 1 of 2 M U - 2 S E R V I C E N E W SMITSUBISHI HEAVY INDUSTRIES, LTD. NAGOYA AEROSPACE SYSTEMS WORKS 10, OYE-CHO, MINATO-KU, NAGOYA, JAPAN JCAB T.C. : No. 206 DATE: September 29, 2022 FAA T.C. : No. 155/21-004 SUBJECT: Preventing Hypoxia Situation MODELS AFFECTED: All MU-2B Airplanes Federal Aviation Administration (FAA) recently published an account of an MU-2B pilot who apparently experienced hypoxia climbing to cruise altitude and the dramatic actions of an air traffic controller to recognize the situation and talk the pilot down to a safe altitude. This is a very rare event for any aircraft but can easily have tragic results if not recognized and corrected promptly. Once recovered at a lower altitude, the pilot recognized that the Cabin Air Selector Switch had not been selected ON in accordance with AFTER TAKEOFF Procedures in the FAA approved Airplane Flight Manual (AFM) and FAA accepted Pilot Checklist. Each person has different susceptibility to hypoxia, but all pilots should be aware that the onset of hypoxia is insidious and progresses gradually. Critical symptoms that may affect your ability to continue flying are impaired judgment, increased response time, confusion and drowsiness. Time of useful consciousness above 10,000 ft. becomes shorter as cabin altitude is increased and includes the time to climb, recognize the onset of hypoxia and subsequent descent. Therefore, although onset is gradual, the situation can become fatal in a short time at cruise altitudes if not recognized. In order to prevent MU-2 pilots from experiencing hypoxia in climb and cruise phases of flight, there are several layers of safety incorporated in the aircraft systems, AFMs, and Pilot Checklists. Mitsubishi Heavy Industries America, Inc. (MHIA) encourages all MU-2 pilots to review the aircraft systems and follow Normal, Emergency, and Abnormal Procedures per AFMs and Pilot Checklists during your flight training and prior to regular flights. In Mitsubishi Heavy Industries, Ltd. (MHI) AFMs and FAA accepted Pilot Checklists, pilots are required to set “Cabin Air Selector Switch” to “BOTH” position and check, set and monitor “Cabin Pressurization” in the AFTER TAKEOFF section of the Normal Procedures. Additionally, if the cabin pressure altitude reaches approximately 10,000 feet, the “Cabin Pressure Low” light Page 2 of 2 M U - 2 S E R V I C E N E W SMITSUBISHI HEAVY INDUSTRIES, LTD. NAGOYA AEROSPACE SYSTEMS WORKS 10, OYE-CHO, MINATO-KU, NAGOYA, JAPAN on the annunciator panel and “Master Caution” light illuminate. If the Cabin Pressure remains low after checking the Cabin Pressurization Controller, Manual Pressure Control Valve, and Cabin Air Selector Switch, pilots are required to descend aircraft to minimum safe altitude or 10,000 feet, whichever is higher, in accordance with the AIR CONDITIONING AND PRESSURIZATION SYSTEM FAILURE (CABIN PRESS LOW ANNUNCIATOR ILLUMINATED) section of the Emergency Procedures. It is in pilots’ best interest to do so! Additionally, as part of the PREFLIGHT CHECK section of the Normal Procedures, pilots are required to open the compartment containing the oxygen valve and check for internal pressure of the Oxygen Cylinder and Oxygen Outlet Valve and Gauge. Masks should be readily available to all pilots and passengers. As a safety enhancement, MHIA offers a Voice Alerting System for MU-2B series aircraft, certified under FAA Supplemental Type Certificate No. SA01300WI. In addition to other alerts, this system provides a spoken warning (“Cabin Pressure Low”) to pilots through both pilot’s and co-pilot’s headsets when the maximum cabin pressure altitude is exceeded. Please refer to MHI Service News No. 167 (A2PC) and No. 120/39-001 (A10SW), dated August 9, 2011. If you have any questions on this matter, please contact MHIA at the following contact information: Mitsubishi Heavy Industries America, Inc. Aircraft Product Support Division 17304 Preston Road, Suite 1270, Dallas, Texas 75252 Email: mu-2support@mhia.com | Website: www.mu-2aircraft.com