Quantcast
ONBOARD OXYGEN GENERATING SYSTEM

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
with steel taps or hobnails. Oxygen-permeated clothing will burn vigorously—a most painful way to die. 11. When servicing a liquid oxygen system, ensure that only oxygen conforming to specifica- tion MIL-0-27210D is used. Oxygen procured under Federal Specification BB-0-925A is intended for technical use and should NOT be used in air- craft oxygen systems. 12. After the completion of repairs, always perform an operational check of the system and make the required tests to ensure that the oxygen is safe for use by the pilot and crew. ONBOARD OXYGEN GENERATING SYSTEM Learning Objective: Identify the system components and operation of the onboard oxygen generating system. The onboard oxygen generating system (OBOGS) is an alternative to liquid oxygen (LOX). When compared to a LOX system, the OBOGS has several advantages. First, its availability y may be as high as 99 percent. There is no requirement for depot-level maintenance. The OBOGS has no daily service requirements, and scheduled preventive maintenance occurs at 2,000 hours. Incorporation of the OBOGS eliminates the need to store and transport LOX. Additionally, it eliminates the need for LOX support equipment. The potential for accidents related to LOX and high-pressure gases is greatly reduced. SYSTEM COMPONENTS The basic components of the OBOGS are the concentrator, oxygen monitor, and oxygen breathing regulator. The concentrator produces an oxygen-rich gas by processing engine bleed air through two sieve beds. The oxygen monitor senses the partial pressure of the gas and, if necessary, provides a low-pressure warning to the pilot. The oxygen regulator is a positive pressure regulator. SYSTEM OPERATION The OBOGS, shown in figure 4-16, receives engine bleed air from the outlet of the air- conditioning heat exchanger. The partially cooled air passes through an air temperature sensor to a pressure reducer assembly. The air is then routed Figure 4-16.—Onboard Oxygen Generating System (OBOGS) schematic. to the concentrator. The concentrator has a rotary valve that alternates the airflow over the molecular sieve beds. The sieve beds absorb the nitrogen and allow the oxygen and argon to pass through. TWO molecular sieve beds are used in the concentrator so that while one bed is absorbing, the other is desorbing (releasing) nitrogen. This method allows a continuous flow of oxygen to the system. After the concentrator, the oxygen flows to a plenum assembly that acts as a surge tank and an accumulator. The plenum also functions as a heat exchanger to heat or cool the oxygen to approximately cockpit temperature. Before the oxygen reaches the oxygen regulator, the oxygen performance monitor senses the partial pressure of the gas and, if necessary, provides a signal to the pilot whenever the pressure exceeds prescribed limits. The oxygen then flows through the regulator to the pilot’s mask. 4-25



Aviation News
Northrop Grumman Opens Aircraft Integration Center
[Aviation Today April 16, 2014] Northrop Grumman announced its dedication of...
aviationtoday.com
L-3 TCAS System Selected for KC-46A
[Avionics Today April 18, 2014] Boeing has selected the T3CAS Integrated...
aviationtoday.com
F-35 to Make First U.K. Flight in July
[Avionics Today April 18, 2014] This summer's Royal International Air Tattoo show...
aviationtoday.com
FAA Extends Deadline for Final Helicopter Safety Rule
April 17In response to industry feedback and so that the...
faa.gov
The 2014 AMC/AEEC Conference
[Avionics Today April 17, 2014] 2014 marks the 65th year...
aviationtoday.com
Lockheed Martin F-35 Fleet Tops 15,000 Flight Hours
[Aviation Today, April 16] Lockheed Martin’s F-35 Lightning 2 fleet...
aviationtoday.com
AirAsia to implement Airbus Managed Inventory service
• Automatically replenishing inventory levels at AirAsia facilities • Guaranteeing...
airbus.com
AgustaWestland Offers New Trainer in U.S. Navy Competition
AgustaWestland, manufacturer of the AW119 Koala, brought a new variant...
aviationtoday.com
Sikorsky Starts Naval Air Systems Command Tests for CH-53K
Sikorsky Aircraft has completed the initial series of tests required...
aviationtoday.com
Army Modifies CH-47F Cargo Contract with Boeing
Boeing was awarded an $8.8 million modification to its existing...
aviationtoday.com
FAA Installs Equipment for NextGen Aircraft Tracking System
The FAA completes equipment installation for ADS-B, the key satellite-based...
faa.gov
Airbus launches new version of ACJ319 corporate jet
Brings big-cabin comfort to broader market Share this Read more...
airbus.com
China’s Tibet Airlines takes delivery of its first A319 with Sharklets
Wing-tip devices further enhance the A319’s superior high altitude performance...
airbus.com
Navy's X-47B Completes First Night Flight
[Avionics Today April 11, 2014] The U.S. Naval Air Systems Command's...
aviationtoday.com
Wind River Powers F-35 Communications in Flight Test
[Avionics Today April 11, 2014] Avionics Magazine recently caught up with...
aviationtoday.com
China’s Qingdao Airlines takes delivery of its first A320
Start-up airline chooses Airbus to launch operations Share this Read...
airbus.com
A350 XWB makes first touchdown in UK
Next generation Airbus flown in by British test pilot Frank...
airbus.com
Airbus’ US A320 Final Assembly Line takes shape
Snapshot one year after ground-breaking in Mobile, Alabama Share this...
airbus.com
Lockheed Martin, Navy Make Autonomous Aerial Strides
[Avionics Today April 10, 2014] Officials from the Office of Naval...
aviationtoday.com
AgustaWestland to Deliver Second AW139 to Armed Forces of Malta
AgustaWestland will provide the Armed Forces of Malta with a...
aviationtoday.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +