IVHMS

Question 1

IAW the rotor smoothing procedure outlined in AWR 1726, how many cumulative notches are we allowed to adjust before we need to perform a dedicated track and balance verification, and are we required to perform an Autorotational %RPM R check?

Answer 1

If main rotor track and balance adjustments are made IAW Appendix C paragraph C.2.2.2, place a dash in the status block to be followed in the Faults/Remarks block with “Main rotor smoothing adjustment completed with a Net Adjustment of +/- XX notches. Current Cumulative Adjustment is +/- YY notches. Rotor Track and Balance and Autorotation %RPM R verification MTF required once the cumulative adjustment exceeds +/-12 notches IAW AWR 1726, dated 10 Mar 21.” This is a reoccurring entry. Continue to add this entry as additional main rotor smoothing adjustments are made, updating the net adjustment and the cumulative adjustment. XX represents the net adjustment for each rotor smoothing adjustment. The net adjustment may exceed +/- 12 notches. FCDD-AMR 10 Mar 21 R31 SUBJECT: Airworthiness Release (AWR) for U.S. Army UH/HH-60M Helicopters (AWR 1726) 14 YY represents the cumulative adjustments made since the last baseline MTF. The cumulative adjustment is the addition of each of the prior net adjustments. If cumulative adjustments since last baseline MTF are unknown, conduct MTF after next rotor smoothing event.

Question 2

At what vibration levels are we required to perform a tail rotor balance?

Answer 2

Exceeding a 7 requires a tail rotor balance. Then balance between .015 to .3 IPS AWR page 14. paragraph 7. (a)

Question 3

Are we required to perform a dedicated tail rotor balance check after the removal and/or replacement of a tail rotor de-ice bracket and boot?

Answer 3

AWR 1726: The requirement to perform a dedicated tail rotor balance check, following the removal and reinstallation/replacement of the tail rotor deice bracket and boot, or deice connectors, is waived.

Question 4

When are we required to check the tail rotor balance after the replacement of a tail rotor de-ice bracket?

Answer 4

Tail Rotor Vibration data shall be acquired (Manually or Automatically) during the First operational flight of the aircraft and downloaded upon completion of the flight for review.

Question 5

For the 120 Hour Engine Output Shaft vibration, is a dedicated ground measurement required?

Answer 5

NO. The dedicated 120-hour single engine ground measurement is no longer required. -Reference AWR 1726 pg 16 paragraph 14.

Question 6

The section one tail rotor drive shaft is dynamically balanced, what parts make up the drive shaft?

Answer 6

Section 1 - drive shaft consist of 2 adapters, 2 flex packs, 1 drive shaft. (5 parts)

Question 7

What components form the IVHMS on board system?

Answer 7

Cockpit Voice Recording (CVR)

Flight Data Recording (FDR)

Health and Usage Monitoring System (HUMS)

Bearing Monitoring Unit (BMU)

Underwater acoustic locating device.

Question 8

What are the CVR external audio recording interfaces?

Answer 8

The area microphone and three narrow bandwidth analog audio inputs interfacing with the ICS - (pilot and co-pilot station, L/R crew chief/gunner stations) to record composite headset audio

Question 9

HUMS functions are divided into what two forms of monitoring?

Answer 9

Health monitoring and Usage monitoring

Question 10

The IVHMU levels of maintenance testing consist of what four software-controlled programs?

Answer 10

PBIT, CBIT, IBIT, and display status and Input/Output (I/O) monitoring.

Question 11

Can an aircraft fly with an inoperative IVHMU?

Answer 11

YES

Question 12

How much flight time can an aircraft fly with an inoperative IVHMU?

Answer 12

Complete next 40hr

Question 13

What are the only means by which IVHMS data is transferred to the ground station and to other data bases?

Answer 13

The Maintenance Card (MC)

Connect aircraft logbook (EDGS) to aircraft – see IVHMS representative

Question 14

The MFDs provide more than 150 pages of IVHMS data from what three main menus?

Answer 14

Main, Maintenance, and Administration

Question 15

The MFD main Maintenance (MAINT) screen displays what?

Answer 15

Software versions, Subsystem Menus, BIT, PARMTR DATA, and RAP TEST

Question 16

The Health Indicator Test (HIT) baseline must be established prior to what?

Answer 16

The maximum power check, prior to first take-off, to replicate daily HIT check procedures.

Question 17

What three tools are available for troubleshooting anomalous aircraft vibrations?

Answer 17

Vibration Harmonic, Airframe Raw, Roving Raw

Question 18

The purpose of the exceedance section is to…?

Answer 18

Alert and present the operator a detailed list of recorded and tracked parameters that have exceeded their limits by being less than or greater than their designated programmed operational limits.

Question 19

What combines to form the IVHMS on board system?

Answer 19

(WP0034)
The Integrated Vehicle Health Management System(IVHMS) combines Cockpit Voice Recording (CVR), Flight Data Recording (FDR), Health And Usage Monitoring System (HUMS), and an underwater acoustic locating device into one Integrated Vehicle Health Management Unit (IVHMU).

Question 20

The Data Transfer Set (DTS) has an internal memory. It is divided into what partitions? (Reference Student Handout)

Answer 20

The DTS has an internal memory, which is divided into USER and CACHE partitions:

1) The USERpartition is used by the DTS for filemanagement; directory structure will automatically be created by the mission planning station on the PCMCIA card(s) and is not relevant to the pilot.

2) The CACHEpartition provides 2 GB of memory forstoring Digital Map (DIG MAP) files for faster processing. Once DIG MAP files have been loaded into the CACHE partition, a PCMCIA card with DIG MAP data is no longer required. Files are retained in the CACHE memory after power is removed from the helicopter and will remain in the CACHE memory until the CACHE partition is zeroized.

Question 21

The UH-60M IVHMS uses how many accelerometers to collect data? (Reference Student Handout)

Answer 21

31 ACCELEROMETERS Student Handout pg 23 Accelerometers.

Question 22

How is IVHMS IBIT initiated through the FMS? Can the BIT be initiated using the MFDs?

Answer 22

TST function Key, Air Vehicle. SK8 IVHMS, SK1 TEST. Can also test off MFD MAINT - IBIT

Question 23

What types of Built in Testing capabilities does IVHMS have?

Answer 23

The DTS incorporates data from Power-on Built-In-Testing (BIT) (PBIT), Continuous BIT CBIT), and an Initiated BIT (IBIT). (Student Handout)

IBIT WP0131

PBIT WP0131

CBIT

Question 24

What three categories make up the main menu?

Answer 24

The MFDs provide more than 150 pages of IVHMS data from three main menus: Main, Maintenance, and Administration. (Student Handout)

Question 25

What are the main rotor track and balance vibration goals in vertical (A+B) and roll (A-B)?

Answer 25

Vertical .25 ips

Roll .20 ips

Question 26

What is the initial high speed shaft balancing goal

Answer 26

.50 ips

Question 27

What are tail rotor balancing criteria in accordance with AWR 1726 R29?

Answer 27

Initial Balance: < 0.15 ips

When Practical: 0.15 – 0.30 ips

Before next 120hr: >0.30 – 0.55 ips

Before next 40hr: >0.55 – 0.70 ips

Before next flight: > 0.70 ips