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ARO CRU-79p question


AMT500E
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AMT500E

Dont know if I have posted this question here before, but Im looking for timeline info on this 

oxygen regulator, and specifically what year or decade the Navy first adopted the model for aviation use.

Im curious if it first saw service in the 80s and would be surprised if it could be traced back to the 70s.

To my understanding, ARO purchased what was originally Firewel, which might explain the (somewhat) resemblance

to the original Firewel F2700.  Any ideas?

IMG_1828.JPG

IMG_1830.JPG

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boxerdogi

Best of Flightgear has a section on mini regulators. If I’m reading correctly....”the development from 1973- 1978 sees the disappearance of the F2700-1 and the introduction of the CRU-79/P”.

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boxerdogi

Aro bought Firewel in 1958, but it appears Firewel kept their name for quite some time afterwards.

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AMT500E

correct and the Aro regulator  (as I have read) followed the design, at least somewhat ,

and with the model number as issued F2700-200c  vs the original Firewel model 2700-1.

Still my biggest question is when did the Navy? deploy the Aro F2700-200c for practical use.

This regulator is really tough to get a handle on regarding what helmet(s) and aircraft it would 

have been used with/in.  Maybe it saw very little use..?

The plot thickens..;-)c 

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Your second photo is a little blurry, but it looks like the regulator has an 85 contract date on it.  NAVAIR 13-1-6.4   Oxygen Equipment   Dated 1 November 1995 lists 5 different miniature regulators made by 6 different corporations.  They are all interchangeable.

 

Miniature Oxygen Breathing Regulator Model 29267-A1 is manufactured by Bendix Aviation Corp. (CAGE 99251), Model 3260024-0101 is manufactured
by Clifton Precision (CAGE 99251) (see figure 8-1), Model 900-002-025-05 is manufactured by Robertshaw Controls Co. (CAGE 00543) and Sabre Industries
(CAGE 27045),(see figure 8-2) and Model F2700-200C is manufactured by Aro Corp. (CAGE 97413) (see figure 8-3) and Model 900-002-025-07 is manufactured by Sabre
Industries (CAGE 27045) (see figure 8-4). They are designed to regulate 100% oxygen to the aircrewman during flight. Table 8-1 contains the leading particulars
for the regulators.

 

Table 8-1. Leading Particulars for Miniature Oxygen
Breathing Regulator Type CRU-79/P    
Recommended Inlet Pressure                40 to 120 psig 
Flow                                                       0 to 100 lpm
Operating Altitude Range                     0 to 50,000 feet
Operating Temperature Range             -65°F to +16°F
Weight                                                  5.0 ounces max

 

The manual also states:

 

Miniature regulators are designed for use with the MBU-14 Series oxygen mask as part of the oxygen system in all aircraft requiring 100% oxygen chest mounted
regulators. Refer to NAVAIR 13-1-6.7 Manual for personal configurations of the MBU-14 Series oxygen masks.

 

NAVAIR 13-1-6.7-3 states:

 

The MBU-14(V)1/P oxygen mask assembly is designed for use in aircraft where the mask is required at all times and an audio amplifier is
required for communication compatibility.

 

Below is the Oxygen Mask Application Matrix that shows what Aircraft the MBU-14 was used on.  So to answer your original question, your Aro regulator could have been used on any aircraft that used the MBU-14 series mask, which was the greatest majority of aircraft flown by the Navy.

 

406466012_DSCN3324(2).JPG.072c231fe3376a96a654640584ae0bdc.JPG

 

 

 

 

 

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