Hi Colleagues,
We are trying to design a Water/Waste System to an aircraft and ground test phase is coming soon. After the installation of system to aircraft, ground test team will test the system with pressurized dry air for leakages. Test duration is 15 minutes and pressure will be measured...
Hi all,
I have to calculate the fluwrate in a 3 m, 3/8" pipe (with some flanges etc.). the driving force of flow is pressure difference: 75,3 kPa on one side of the pipe and 44,1 kPa on the other side. it seems like a very straightforward problem but I couldn't find something useful in 3 fluid...
Hi all,
I have a problem about a small air ventilation pipe that will be installed on an A/C. the pipe inner diameter is 8,305 mm. Pressure difference between the two ends of the pipe varies from zero to 56 kPa. We are expecting air flow rates up to 11 lt/s from this pipe.
A flight test team...
Hi all.
We have a supplier who will provide us air flow sensors for some air ventilation lines. They require us to provide minimum venturi diameter/pipe diameter ratio avoiding a shock wave. I haven't been working in aerodynamics field for years and couldn't find a quick calculation method. do...
Hi all,
I am currently working on some environmental qualification tests (actually, almost all kinds that can be applied to cargo A/C internal and external equipment) , using RTCA DO 160, MIL STD 810 and some other standards. I have never done this before and I want to get some experience in...
Hi all,
Has anyone performed leakage tests with air on hydraulic/fuel/water system after installation? Our contractor insists that a small amount of air leakage occurs in pumps/valves/closures, and a threshold is necessary to define the amount of leakage to say that test is failed. But we've...
Dear Colleagues,
I'm having some problem with valves nowadays.
The following text is from FAA internet site:
"the largest and most potentially dangerous pieces of "blue ice" have been associated with "donut" valves"
I couldn't find information/drawing/at least a sketch about what FAA calls...
Hi all,
I have received the following mail from a consultant:
"The reliability of this design is depending on the detailed design of the valve and seals; for example a swimming bowl design could achieve higher reliability than a fixed bowl design."
Frankly, don't know what he speaks about...
Hi all,
I'm trying to find some temperature data (minimum temperature with 1% probability, or a temperature distribution) for 30000 feet on winter days and around 40 degrees latitude.
I know that "U.S. Standard Atmosphere Supplements, 1966" has some information similar to this, but I could not...
Hi all,
I have a major problem on defining g loads for ceash safety qualification tests. RTCA DO 160E Chapter 7 Defines 20g for 11-20 ms, while MIL-STD-810F Method 516.5 chapter 4.5.6.1 defines 40g's for 15-23 ms's.
IMHO, 40g is not a logical test level for aircraft other than fighters, -which...
