DMRS Product Knowledge Flashcards
What is the difference between the IF CCA installed in the HG2291AB01 Mod 0 and the IF CCA installed in HG2291AB01 Mod 1/HG2291AB02 Mod 0?
There is PN difference.
The IF CCA PN installed in the AB01 Mod 0 (26021131-111) is 26021137-206 or 26021137-207.
The IF CCA PN installed in the AB01 Mod 1/AB02 Mod is 26021137-301.
They have different Field Programmable Grid Array (FPGA) versions.
How many versions of the 787 are there?
There are three different versions of the 787 (-7,-9,-10)
When Honeywell purchased MEMS technology, what improvements were there?
made 5 major design changes Block A to Block E
How many Boeing planes had AB02 installed in them for qualification for us to get them into production? What did Tim say about the performance difference Boeing found between the AB01 and AB02?
5 planes had AB02s installed in them
-First half of 2023 they confirmed that the performance was better than the AB01
What is difference between P1C sensors and B4C sensors?
P1C sensors
-Are in plane sensors
-The die on the sensor is aligned in the sensor
B4C Sensors
-1 of the sensor are out of plane
What material was put on the AB02 flex tape? Why this material?
Kapton is the material. Due to its large range of temperature stability and its electrical isolation ability, Kapton tape is usually used in electronic manufacturing as an insulation and protection layer on electrostatic-sensitive and fragile components.
What does a stuck down sensors mean?
The sensor die is not moving
What was the most common manufacturing issue for P1C gyro CCA sensors? What performance issues were seen?
The design of the P1C is hard to manufacture because FOD easily caught in the proof mass and the sensor die of the P1C gyro
- Changes in bias shifts
- AGC mode faults
Why was the FPGA in the AB01 Mod 0 changed in the AB01 Mod 1? What issues does this cause?
The FPGA in the AB01 Mod 0 is just programming the gyro card at 1 frequency value to three of the 3 analog Asics to the sensors
-Wobbling occurred
-Fingers were touching the bottom plate or other fingers
-Sensor stuck down failures
What year did we have major problems with stuck down sensors?
We had problems with stuck down sensors in 2015
Who is our supplier of P1C sensors? What improvement did they make to make the sensors?
Plymouth edited the wafer curvature and did a flatness test for P1C sensors
What did the MN engineers call the wobbliness detected during test start up at gyro thermal?
They called it Rooster (sensor makes noise)
Where can I find the FPGA program version?
On the HG2291 drawing it gives a FPGA program version
How does the DMRS transmit the FPGA version?
It transmits the FPGA version to its data word. We read it during ATP
